diff --git a/doc/rust.md b/doc/rust.md
index 34fd7cf25d6..190314b2ec3 100644
--- a/doc/rust.md
+++ b/doc/rust.md
@@ -448,10 +448,10 @@ expression context, the final namespace qualifier is omitted.
 Two examples of paths with type arguments:
 
 ~~~~
-# use std::map;
+# use std::oldmap;
 # fn f() {
 # fn id<T:Copy>(t: T) -> T { t }
-type t = map::HashMap<int,~str>;  // Type arguments used in a type expression
+type t = oldmap::HashMap<int,~str>;  // Type arguments used in a type expression
 let x = id::<int>(10);           // Type arguments used in a call expression
 # }
 ~~~~
diff --git a/doc/tutorial.md b/doc/tutorial.md
index 6ccf13a8d4d..df2618c74e1 100644
--- a/doc/tutorial.md
+++ b/doc/tutorial.md
@@ -1791,7 +1791,7 @@ illegal to copy and pass by value.
 Generic `type`, `struct`, and `enum` declarations follow the same pattern:
 
 ~~~~
-# use std::map::HashMap;
+# use std::oldmap::HashMap;
 type Set<T> = HashMap<T, ()>;
 
 struct Stack<T> {
diff --git a/src/libcargo/cargo.rc b/src/libcargo/cargo.rc
index cb455852261..960bcf88eb7 100644
--- a/src/libcargo/cargo.rc
+++ b/src/libcargo/cargo.rc
@@ -53,8 +53,8 @@ use core::io::WriterUtil;
 use core::result::{Ok, Err};
 use core::hashmap::linear::LinearMap;
 use std::getopts::{optflag, optopt, opt_present};
-use std::map::HashMap;
-use std::{map, json, tempfile, term, sort, getopts};
+use std::oldmap::HashMap;
+use std::{oldmap, json, tempfile, term, sort, getopts};
 use syntax::codemap::span;
 use syntax::diagnostic::span_handler;
 use syntax::diagnostic;
@@ -110,9 +110,9 @@ pub struct Cargo {
     libdir: Path,
     workdir: Path,
     sourcedir: Path,
-    sources: map::HashMap<~str, @Source>,
+    sources: oldmap::HashMap<~str, @Source>,
     mut current_install: ~str,
-    dep_cache: map::HashMap<~str, bool>,
+    dep_cache: oldmap::HashMap<~str, bool>,
     opts: Options
 }
 
@@ -490,7 +490,7 @@ pub fn parse_source(name: ~str, j: &json::Json) -> @Source {
 }
 
 pub fn try_parse_sources(filename: &Path,
-                         sources: map::HashMap<~str, @Source>) {
+                         sources: oldmap::HashMap<~str, @Source>) {
     if !os::path_exists(filename)  { return; }
     let c = io::read_whole_file_str(filename);
     match json::from_str(c.get()) {
@@ -730,7 +730,7 @@ pub fn configure(opts: Options) -> Cargo {
     need_dir(&c.libdir);
     need_dir(&c.bindir);
 
-    for sources.each_key |k| {
+    for sources.each_key_ref |&k| {
         let mut s = sources.get(k);
         load_source_packages(&c, s);
         sources.insert(k, s);
@@ -748,7 +748,7 @@ pub fn configure(opts: Options) -> Cargo {
 }
 
 pub fn for_each_package(c: &Cargo, b: fn(s: @Source, p: &Package)) {
-    for c.sources.each_value |v| {
+    for c.sources.each_value_ref |&v| {
         for v.packages.each |p| {
             b(v, p);
         }
@@ -833,7 +833,7 @@ pub fn rustc_sysroot() -> ~str {
     }
 }
 
-pub fn install_source(c: &Cargo, path: &Path) {
+pub fn install_source(c: &mut Cargo, path: &Path) {
     debug!("source: %s", path.to_str());
     os::change_dir(path);
 
@@ -872,7 +872,8 @@ pub fn install_source(c: &Cargo, path: &Path) {
     }
 }
 
-pub fn install_git(c: &Cargo, wd: &Path, url: ~str, reference: Option<~str>) {
+pub fn install_git(c: &mut Cargo, wd: &Path, url: ~str,
+                   reference: Option<~str>) {
     run::program_output(~"git", ~[~"clone", url, wd.to_str()]);
     if reference.is_some() {
         let r = reference.get();
@@ -883,7 +884,7 @@ pub fn install_git(c: &Cargo, wd: &Path, url: ~str, reference: Option<~str>) {
     install_source(c, wd);
 }
 
-pub fn install_curl(c: &Cargo, wd: &Path, url: ~str) {
+pub fn install_curl(c: &mut Cargo, wd: &Path, url: ~str) {
     let tarpath = wd.push("pkg.tar");
     let p = run::program_output(~"curl", ~[~"-f", ~"-s", ~"-o",
                                          tarpath.to_str(), url]);
@@ -896,14 +897,14 @@ pub fn install_curl(c: &Cargo, wd: &Path, url: ~str) {
     install_source(c, wd);
 }
 
-pub fn install_file(c: &Cargo, wd: &Path, path: &Path) {
+pub fn install_file(c: &mut Cargo, wd: &Path, path: &Path) {
     run::program_output(~"tar", ~[~"-x", ~"--strip-components=1",
                                   ~"-C", wd.to_str(),
                                   ~"-f", path.to_str()]);
     install_source(c, wd);
 }
 
-pub fn install_package(c: &Cargo, src: ~str, wd: &Path, pkg: Package) {
+pub fn install_package(c: &mut Cargo, src: ~str, wd: &Path, pkg: Package) {
     let url = copy pkg.url;
     let method = match pkg.method {
         ~"git" => ~"git",
@@ -922,7 +923,7 @@ pub fn install_package(c: &Cargo, src: ~str, wd: &Path, pkg: Package) {
 }
 
 pub fn cargo_suggestion(c: &Cargo, fallback: fn()) {
-    if c.sources.size() == 0u {
+    if c.sources.is_empty() {
         error(~"no sources defined - you may wish to run " +
               ~"`cargo init`");
         return;
@@ -930,7 +931,7 @@ pub fn cargo_suggestion(c: &Cargo, fallback: fn()) {
     fallback();
 }
 
-pub fn install_uuid(c: &Cargo, wd: &Path, uuid: ~str) {
+pub fn install_uuid(c: &mut Cargo, wd: &Path, uuid: ~str) {
     let mut ps = ~[];
     for_each_package(c, |s, p| {
         if p.uuid == uuid {
@@ -954,7 +955,7 @@ pub fn install_uuid(c: &Cargo, wd: &Path, uuid: ~str) {
     }
 }
 
-pub fn install_named(c: &Cargo, wd: &Path, name: ~str) {
+pub fn install_named(c: &mut Cargo, wd: &Path, name: ~str) {
     let mut ps = ~[];
     for_each_package(c, |s, p| {
         if p.name == name {
@@ -978,7 +979,8 @@ pub fn install_named(c: &Cargo, wd: &Path, name: ~str) {
     }
 }
 
-pub fn install_uuid_specific(c: &Cargo, wd: &Path, src: ~str, uuid: ~str) {
+pub fn install_uuid_specific(c: &mut Cargo, wd: &Path, src: ~str,
+                             uuid: ~str) {
     match c.sources.find(src) {
         Some(s) => {
             for s.packages.each |p| {
@@ -993,7 +995,8 @@ pub fn install_uuid_specific(c: &Cargo, wd: &Path, src: ~str, uuid: ~str) {
     error(~"can't find package: " + src + ~"/" + uuid);
 }
 
-pub fn install_named_specific(c: &Cargo, wd: &Path, src: ~str, name: ~str) {
+pub fn install_named_specific(c: &mut Cargo, wd: &Path, src: ~str,
+                              name: ~str) {
     match c.sources.find(src) {
         Some(s) => {
             for s.packages.each |p| {
@@ -1060,7 +1063,7 @@ pub fn cmd_uninstall(c: &Cargo) {
     }
 }
 
-pub fn install_query(c: &Cargo, wd: &Path, target: ~str) {
+pub fn install_query(c: &mut Cargo, wd: &Path, target: ~str) {
     match c.dep_cache.find(target) {
         Some(inst) => {
             if inst {
@@ -1112,10 +1115,7 @@ pub fn install_query(c: &Cargo, wd: &Path, target: ~str) {
     // a bit of a hack. It should be cleaned up in the future.
 
     if target == c.current_install {
-        for c.dep_cache.each |k, _v| {
-            c.dep_cache.remove(k);
-        }
-
+        c.dep_cache.clear();
         c.current_install = ~"";
     }
 }
@@ -1128,7 +1128,7 @@ pub fn get_temp_workdir(c: &Cargo) -> Path {
     }
 }
 
-pub fn cmd_install(c: &Cargo) {
+pub fn cmd_install(c: &mut Cargo) {
     unsafe {
         let wd = get_temp_workdir(c);
 
@@ -1155,7 +1155,7 @@ pub fn cmd_install(c: &Cargo) {
 }
 
 pub fn sync(c: &Cargo) {
-    for c.sources.each_key |k| {
+    for c.sources.each_key_ref |&k| {
         let mut s = c.sources.get(k);
         sync_one(c, s);
         c.sources.insert(k, s);
@@ -1569,7 +1569,7 @@ pub fn cmd_list(c: &Cargo) {
             }
         }
     } else {
-        for c.sources.each_value |v| {
+        for c.sources.each_value_ref |&v| {
             print_source(v);
         }
     }
@@ -1620,7 +1620,7 @@ pub fn dump_cache(c: &Cargo) {
 }
 
 pub fn dump_sources(c: &Cargo) {
-    if c.sources.size() < 1u {
+    if c.sources.is_empty() {
         return;
     }
 
@@ -1636,7 +1636,7 @@ pub fn dump_sources(c: &Cargo) {
         result::Ok(writer) => {
             let mut hash = ~LinearMap::new();
 
-            for c.sources.each |k, v| {
+            for c.sources.each_ref |&k, &v| {
                 let mut chash = ~LinearMap::new();
 
                 chash.insert(~"url", json::String(v.url));
@@ -1675,7 +1675,7 @@ pub fn copy_warn(srcfile: &Path, destfile: &Path) {
 
 pub fn cmd_sources(c: &Cargo) {
     if vec::len(c.opts.free) < 3u {
-        for c.sources.each_value |v| {
+        for c.sources.each_value_ref |&v| {
             info(fmt!("%s (%s) via %s",
                       v.name, v.url, v.method));
         }
@@ -1686,8 +1686,8 @@ pub fn cmd_sources(c: &Cargo) {
 
     match action {
         ~"clear" => {
-          for c.sources.each_key |k| {
-                c.sources.remove(k);
+          for c.sources.each_key_ref |&k| {
+                c.sources.remove(&k);
             }
 
             info(~"cleared sources");
@@ -1706,7 +1706,7 @@ pub fn cmd_sources(c: &Cargo) {
                 return;
             }
 
-            if c.sources.contains_key(name) {
+            if c.sources.contains_key_ref(&name) {
                 error(fmt!("source already exists: %s", name));
             } else {
                 c.sources.insert(name, @Source {
@@ -1733,8 +1733,8 @@ pub fn cmd_sources(c: &Cargo) {
                 return;
             }
 
-            if c.sources.contains_key(name) {
-                c.sources.remove(name);
+            if c.sources.contains_key_ref(&name) {
+                c.sources.remove(&name);
                 info(fmt!("removed source: %s", name));
             } else {
                 error(fmt!("no such source: %s", name));
@@ -1825,7 +1825,7 @@ pub fn cmd_sources(c: &Cargo) {
 
             match c.sources.find(name) {
                 Some(source) => {
-                    c.sources.remove(name);
+                    c.sources.remove(&name);
                     c.sources.insert(newn, source);
                     info(fmt!("renamed source: %s to %s", name, newn));
                 }
@@ -1967,7 +1967,7 @@ pub fn main() {
 
     match o.free[1] {
         ~"init" => cmd_init(&c),
-        ~"install" => cmd_install(&c),
+        ~"install" => cmd_install(&mut c),
         ~"uninstall" => cmd_uninstall(&c),
         ~"list" => cmd_list(&c),
         ~"search" => cmd_search(&c),
diff --git a/src/librustc/back/link.rs b/src/librustc/back/link.rs
index 2a07de5caea..22923cb7290 100644
--- a/src/librustc/back/link.rs
+++ b/src/librustc/back/link.rs
@@ -36,7 +36,7 @@ use core::ptr;
 use core::run;
 use core::str;
 use core::vec;
-use std::map::HashMap;
+use std::oldmap::HashMap;
 use std::sha1::sha1;
 use syntax::ast;
 use syntax::ast_map::{path, path_mod, path_name};
diff --git a/src/librustc/back/rpath.rs b/src/librustc/back/rpath.rs
index d8d412eaedc..f6a5fec75ad 100644
--- a/src/librustc/back/rpath.rs
+++ b/src/librustc/back/rpath.rs
@@ -18,8 +18,8 @@ use core::os;
 use core::uint;
 use core::util;
 use core::vec;
-use std::map::HashMap;
-use std::map;
+use std::oldmap::HashMap;
+use std::oldmap;
 
 pure fn not_win32(os: session::os) -> bool {
   match os {
@@ -187,7 +187,7 @@ pub fn get_install_prefix_rpath(target_triple: &str) -> Path {
 }
 
 pub fn minimize_rpaths(rpaths: &[Path]) -> ~[Path] {
-    let set = map::HashMap();
+    let set = oldmap::HashMap();
     let mut minimized = ~[];
     for rpaths.each |rpath| {
         let s = rpath.to_str();
diff --git a/src/librustc/driver/driver.rs b/src/librustc/driver/driver.rs
index 3dd49f661ee..1464fa29afc 100644
--- a/src/librustc/driver/driver.rs
+++ b/src/librustc/driver/driver.rs
@@ -35,7 +35,7 @@ use std::getopts::groups::{optopt, optmulti, optflag, optflagopt, getopts};
 use std::getopts::groups;
 use std::getopts::{opt_present};
 use std::getopts;
-use std::map::HashMap;
+use std::oldmap::HashMap;
 use std;
 use syntax::ast;
 use syntax::ast_map;
diff --git a/src/librustc/lib/llvm.rs b/src/librustc/lib/llvm.rs
index 8ba15bf3930..e114a18f4fd 100644
--- a/src/librustc/lib/llvm.rs
+++ b/src/librustc/lib/llvm.rs
@@ -20,7 +20,7 @@ use core::ptr;
 use core::str;
 use core::uint;
 use core::vec;
-use std::map::HashMap;
+use std::oldmap::HashMap;
 
 pub type Opcode = u32;
 pub type Bool = c_uint;
diff --git a/src/librustc/metadata/creader.rs b/src/librustc/metadata/creader.rs
index f1430441ab8..66956489a27 100644
--- a/src/librustc/metadata/creader.rs
+++ b/src/librustc/metadata/creader.rs
@@ -30,7 +30,7 @@ use syntax::parse::token::ident_interner;
 use syntax::print::pprust;
 use syntax::visit;
 use syntax::{ast, ast_util};
-use std::map::HashMap;
+use std::oldmap::HashMap;
 
 // Traverses an AST, reading all the information about use'd crates and extern
 // libraries necessary for later resolving, typechecking, linking, etc.
diff --git a/src/librustc/metadata/csearch.rs b/src/librustc/metadata/csearch.rs
index 1204fdf1837..59cc7d1dba6 100644
--- a/src/librustc/metadata/csearch.rs
+++ b/src/librustc/metadata/csearch.rs
@@ -23,7 +23,7 @@ use core::dvec::DVec;
 use core::vec;
 use reader = std::ebml::reader;
 use std::ebml;
-use std::map::HashMap;
+use std::oldmap::HashMap;
 use syntax::ast;
 use syntax::ast_map;
 use syntax::codemap::dummy_sp;
diff --git a/src/librustc/metadata/cstore.rs b/src/librustc/metadata/cstore.rs
index f2bd998b557..c8a1a619436 100644
--- a/src/librustc/metadata/cstore.rs
+++ b/src/librustc/metadata/cstore.rs
@@ -21,8 +21,8 @@ use metadata::decoder;
 use core::option;
 use core::str;
 use core::vec;
-use std::map::HashMap;
-use std::map;
+use std::oldmap::HashMap;
+use std::oldmap;
 use std;
 use syntax::{ast, attr};
 use syntax::parse::token::ident_interner;
@@ -31,7 +31,7 @@ use syntax::parse::token::ident_interner;
 // local crate numbers (as generated during this session). Each external
 // crate may refer to types in other external crates, and each has their
 // own crate numbers.
-pub type cnum_map = map::HashMap<ast::crate_num, ast::crate_num>;
+pub type cnum_map = oldmap::HashMap<ast::crate_num, ast::crate_num>;
 
 pub type crate_metadata = @{name: ~str,
                             data: @~[u8],
@@ -46,7 +46,7 @@ pub type crate_metadata = @{name: ~str,
 pub enum CStore { private(cstore_private), }
 
 type cstore_private =
-    @{metas: map::HashMap<ast::crate_num, crate_metadata>,
+    @{metas: oldmap::HashMap<ast::crate_num, crate_metadata>,
       use_crate_map: use_crate_map,
       mut used_crate_files: ~[Path],
       mut used_libraries: ~[~str],
@@ -54,7 +54,7 @@ type cstore_private =
       intr: @ident_interner};
 
 // Map from node_id's of local use statements to crate numbers
-type use_crate_map = map::HashMap<ast::node_id, ast::crate_num>;
+type use_crate_map = oldmap::HashMap<ast::node_id, ast::crate_num>;
 
 // Internal method to retrieve the data from the cstore
 pure fn p(cstore: CStore) -> cstore_private {
@@ -62,8 +62,8 @@ pure fn p(cstore: CStore) -> cstore_private {
 }
 
 pub fn mk_cstore(intr: @ident_interner) -> CStore {
-    let meta_cache = map::HashMap();
-    let crate_map = map::HashMap();
+    let meta_cache = oldmap::HashMap();
+    let crate_map = oldmap::HashMap();
     return private(@{metas: meta_cache,
                      use_crate_map: crate_map,
                      mut used_crate_files: ~[],
@@ -94,12 +94,12 @@ pub fn set_crate_data(cstore: CStore,
 }
 
 pub fn have_crate_data(cstore: CStore, cnum: ast::crate_num) -> bool {
-    return p(cstore).metas.contains_key(cnum);
+    return p(cstore).metas.contains_key_ref(&cnum);
 }
 
 pub fn iter_crate_data(cstore: CStore,
                        i: fn(ast::crate_num, crate_metadata)) {
-    for p(cstore).metas.each |k,v| { i(k, v);};
+    for p(cstore).metas.each_ref |&k, &v| { i(k, v);};
 }
 
 pub fn add_used_crate_file(cstore: CStore, lib: &Path) {
@@ -148,7 +148,7 @@ pub fn get_dep_hashes(cstore: CStore) -> ~[~str] {
     type crate_hash = {name: ~str, hash: ~str};
     let mut result = ~[];
 
-    for p(cstore).use_crate_map.each_value |cnum| {
+    for p(cstore).use_crate_map.each_value_ref |&cnum| {
         let cdata = cstore::get_crate_data(cstore, cnum);
         let hash = decoder::get_crate_hash(cdata.data);
         debug!("Add hash[%s]: %s", cdata.name, hash);
diff --git a/src/librustc/metadata/decoder.rs b/src/librustc/metadata/decoder.rs
index a293fc6a13d..c3c7c969cd8 100644
--- a/src/librustc/metadata/decoder.rs
+++ b/src/librustc/metadata/decoder.rs
@@ -36,8 +36,8 @@ use core::str;
 use core::vec;
 use std::ebml::reader;
 use std::ebml;
-use std::map::HashMap;
-use std::map;
+use std::oldmap::HashMap;
+use std::oldmap;
 use std::serialize::Decodable;
 use syntax::ast_map;
 use syntax::attr;
diff --git a/src/librustc/metadata/encoder.rs b/src/librustc/metadata/encoder.rs
index c6be09725e4..438084a3bd7 100644
--- a/src/librustc/metadata/encoder.rs
+++ b/src/librustc/metadata/encoder.rs
@@ -36,9 +36,9 @@ use core::str;
 use core::to_bytes::IterBytes;
 use core::uint;
 use core::vec;
-use std::map::HashMap;
+use std::oldmap::HashMap;
 use std::serialize::Encodable;
-use std::{ebml, map};
+use std::{ebml, oldmap};
 use std;
 use syntax::ast::*;
 use syntax::ast;
@@ -52,7 +52,7 @@ use syntax;
 use writer = std::ebml::writer;
 
 // used by astencode:
-type abbrev_map = map::HashMap<ty::t, tyencode::ty_abbrev>;
+type abbrev_map = oldmap::HashMap<ty::t, tyencode::ty_abbrev>;
 
 pub type encode_inlined_item = fn@(ecx: @encode_ctxt,
                                    ebml_w: writer::Encoder,
@@ -99,7 +99,7 @@ pub enum encode_ctxt = {
 };
 
 pub fn reachable(ecx: @encode_ctxt, id: node_id) -> bool {
-    ecx.reachable.contains_key(id)
+    ecx.reachable.contains_key_ref(&id)
 }
 
 fn encode_name(ecx: @encode_ctxt, ebml_w: writer::Encoder, name: ident) {
diff --git a/src/librustc/metadata/tydecode.rs b/src/librustc/metadata/tydecode.rs
index 56df92da987..5dd499dfd63 100644
--- a/src/librustc/metadata/tydecode.rs
+++ b/src/librustc/metadata/tydecode.rs
@@ -27,7 +27,7 @@ use core::vec;
 use syntax::ast;
 use syntax::ast::*;
 use syntax::codemap::{respan, dummy_sp};
-use std::map::HashMap;
+use std::oldmap::HashMap;
 
 // Compact string representation for ty::t values. API ty_str &
 // parse_from_str. Extra parameters are for converting to/from def_ids in the
diff --git a/src/librustc/metadata/tyencode.rs b/src/librustc/metadata/tyencode.rs
index f02f187c629..a0e2065b20b 100644
--- a/src/librustc/metadata/tyencode.rs
+++ b/src/librustc/metadata/tyencode.rs
@@ -20,7 +20,7 @@ use core::io::WriterUtil;
 use core::io;
 use core::uint;
 use core::vec;
-use std::map::HashMap;
+use std::oldmap::HashMap;
 use syntax::ast::*;
 use syntax::diagnostic::span_handler;
 use syntax::print::pprust::*;
diff --git a/src/librustc/middle/astencode.rs b/src/librustc/middle/astencode.rs
index 8ea3d813752..2fc592e131e 100644
--- a/src/librustc/middle/astencode.rs
+++ b/src/librustc/middle/astencode.rs
@@ -31,7 +31,7 @@ use std::ebml::reader::get_doc;
 use std::ebml::reader;
 use std::ebml::writer::Encoder;
 use std::ebml;
-use std::map::HashMap;
+use std::oldmap::HashMap;
 use std::prettyprint;
 use std::serialize;
 use std::serialize::{Encodable, EncoderHelpers, DecoderHelpers};
diff --git a/src/librustc/middle/borrowck/check_loans.rs b/src/librustc/middle/borrowck/check_loans.rs
index 76b3aea2dd1..19740b6a929 100644
--- a/src/librustc/middle/borrowck/check_loans.rs
+++ b/src/librustc/middle/borrowck/check_loans.rs
@@ -35,7 +35,7 @@ use core::cmp;
 use core::dvec::DVec;
 use core::uint;
 use core::vec;
-use std::map::HashMap;
+use std::oldmap::HashMap;
 use syntax::ast::{m_const, m_imm, m_mutbl};
 use syntax::ast;
 use syntax::ast_util;
@@ -665,7 +665,7 @@ fn check_loans_in_expr(expr: @ast::expr,
 
     self.check_for_conflicting_loans(expr.id);
 
-    if self.bccx.moves_map.contains_key(expr.id) {
+    if self.bccx.moves_map.contains_key_ref(&expr.id) {
         self.check_move_out_from_expr(expr);
     }
 
@@ -686,7 +686,7 @@ fn check_loans_in_expr(expr: @ast::expr,
       }
       ast::expr_index(_, rval) |
       ast::expr_binary(_, _, rval)
-      if self.bccx.method_map.contains_key(expr.id) => {
+      if self.bccx.method_map.contains_key_ref(&expr.id) => {
         self.check_call(expr,
                         None,
                         expr.callee_id,
@@ -694,7 +694,7 @@ fn check_loans_in_expr(expr: @ast::expr,
                         ~[rval]);
       }
       ast::expr_unary(*) | ast::expr_index(*)
-      if self.bccx.method_map.contains_key(expr.id) => {
+      if self.bccx.method_map.contains_key_ref(&expr.id) => {
         self.check_call(expr,
                         None,
                         expr.callee_id,
diff --git a/src/librustc/middle/borrowck/gather_loans.rs b/src/librustc/middle/borrowck/gather_loans.rs
index bfcdacf811d..b7b99424924 100644
--- a/src/librustc/middle/borrowck/gather_loans.rs
+++ b/src/librustc/middle/borrowck/gather_loans.rs
@@ -33,7 +33,7 @@ use util::ppaux::{expr_repr, region_to_str};
 use core::dvec;
 use core::hashmap::linear::LinearSet;
 use core::vec;
-use std::map::HashMap;
+use std::oldmap::HashMap;
 use syntax::ast::{m_const, m_imm, m_mutbl};
 use syntax::ast;
 use syntax::codemap::span;
@@ -204,7 +204,7 @@ fn req_loans_in_expr(ex: @ast::expr,
       ast::expr_binary(_, rcvr, _) |
       ast::expr_unary(_, rcvr) |
       ast::expr_assign_op(_, rcvr, _)
-      if self.bccx.method_map.contains_key(ex.id) => {
+      if self.bccx.method_map.contains_key_ref(&ex.id) => {
         // Receivers in method calls are always passed by ref.
         //
         // Here, in an overloaded operator, the call is this expression,
@@ -241,7 +241,7 @@ fn req_loans_in_expr(ex: @ast::expr,
       // }
 
       ast::expr_field(rcvr, _, _)
-      if self.bccx.method_map.contains_key(ex.id) => {
+      if self.bccx.method_map.contains_key_ref(&ex.id) => {
         // Receivers in method calls are always passed by ref.
         //
         // Here, the field a.b is in fact a closure.  Eventually, this
diff --git a/src/librustc/middle/borrowck/mod.rs b/src/librustc/middle/borrowck/mod.rs
index c0c59c68699..b160c2e5a14 100644
--- a/src/librustc/middle/borrowck/mod.rs
+++ b/src/librustc/middle/borrowck/mod.rs
@@ -241,7 +241,7 @@ use core::io;
 use core::result::{Result, Ok, Err};
 use std::list::{List, Cons, Nil};
 use std::list;
-use std::map::{HashMap, Set};
+use std::oldmap::{HashMap, Set};
 use syntax::ast::{mutability, m_mutbl, m_imm, m_const};
 use syntax::ast;
 use syntax::ast_map;
diff --git a/src/librustc/middle/borrowck/preserve.rs b/src/librustc/middle/borrowck/preserve.rs
index 570b439cf8c..3bc34d2ef29 100644
--- a/src/librustc/middle/borrowck/preserve.rs
+++ b/src/librustc/middle/borrowck/preserve.rs
@@ -375,7 +375,7 @@ impl PreserveCtxt {
                 // scope_id;`. Though that would potentially re-introduce
                 // the ICE. See #3511 for more details.
                 let scope_to_use = if
-                    self.bccx.stmt_map.contains_key(scope_id) {
+                    self.bccx.stmt_map.contains_key_ref(&scope_id) {
                     // Root it in its parent scope, b/c
                     // trans won't introduce a new scope for the
                     // stmt
diff --git a/src/librustc/middle/check_const.rs b/src/librustc/middle/check_const.rs
index 0ed3a1a849d..98c3fdaa8c3 100644
--- a/src/librustc/middle/check_const.rs
+++ b/src/librustc/middle/check_const.rs
@@ -18,7 +18,7 @@ use util::ppaux;
 
 use core::dvec::DVec;
 use core::option;
-use std::map::HashMap;
+use std::oldmap::HashMap;
 use syntax::ast::*;
 use syntax::codemap;
 use syntax::{visit, ast_util, ast_map};
@@ -102,7 +102,7 @@ pub fn check_expr(sess: Session,
           }
           expr_lit(@codemap::spanned {node: lit_str(_), _}) => { }
           expr_binary(_, _, _) | expr_unary(_, _) => {
-            if method_map.contains_key(e.id) {
+            if method_map.contains_key_ref(&e.id) {
                 sess.span_err(e.span, ~"user-defined operators are not \
                                        allowed in constant expressions");
             }
diff --git a/src/librustc/middle/check_match.rs b/src/librustc/middle/check_match.rs
index 3ce1e859826..e25ceee5d30 100644
--- a/src/librustc/middle/check_match.rs
+++ b/src/librustc/middle/check_match.rs
@@ -23,7 +23,7 @@ use core::cmp;
 use core::option;
 use core::uint;
 use core::vec;
-use std::map::HashMap;
+use std::oldmap::HashMap;
 use std::sort;
 use syntax::ast::*;
 use syntax::ast_util::{variant_def_ids, unguarded_pat, walk_pat};
@@ -59,7 +59,7 @@ pub fn expr_is_non_moving_lvalue(cx: @MatchCheckCtxt, expr: @expr) -> bool {
         return false;
     }
 
-    !cx.moves_map.contains_key(expr.id)
+    !cx.moves_map.contains_key_ref(&expr.id)
 }
 
 pub fn check_expr(cx: @MatchCheckCtxt, ex: @expr, &&s: (), v: visit::vt<()>) {
@@ -734,7 +734,7 @@ pub fn check_legality_of_move_bindings(cx: @MatchCheckCtxt,
                     by_ref_span = Some(span);
                 }
                 bind_infer => {
-                    if cx.moves_map.contains_key(id) {
+                    if cx.moves_map.contains_key_ref(&id) {
                         any_by_move = true;
                     }
                 }
@@ -774,7 +774,7 @@ pub fn check_legality_of_move_bindings(cx: @MatchCheckCtxt,
             if pat_is_binding(def_map, p) {
                 match p.node {
                     pat_ident(_, _, sub) => {
-                        if cx.moves_map.contains_key(p.id) {
+                        if cx.moves_map.contains_key_ref(&p.id) {
                             check_move(p, sub);
                         }
                     }
@@ -800,7 +800,7 @@ pub fn check_legality_of_move_bindings(cx: @MatchCheckCtxt,
                                 behind_bad_pointer);
 
                         if behind_bad_pointer &&
-                            cx.moves_map.contains_key(pat.id)
+                            cx.moves_map.contains_key_ref(&pat.id)
                         {
                             cx.tcx.sess.span_err(
                                 pat.span,
diff --git a/src/librustc/middle/freevars.rs b/src/librustc/middle/freevars.rs
index 724f70b53d6..1e9d8c9c08e 100644
--- a/src/librustc/middle/freevars.rs
+++ b/src/librustc/middle/freevars.rs
@@ -18,7 +18,7 @@ use middle::ty;
 use core::int;
 use core::option::*;
 use core::vec;
-use std::map::*;
+use std::oldmap::*;
 use syntax::codemap::span;
 use syntax::print::pprust::path_to_str;
 use syntax::{ast, ast_util, visit};
@@ -71,7 +71,7 @@ fn collect_freevars(def_map: resolve::DefMap, blk: ast::blk)
                       }
                       if i == depth { // Made it to end of loop
                         let dnum = ast_util::def_id_of_def(def).node;
-                        if !seen.contains_key(dnum) {
+                        if !seen.contains_key_ref(&dnum) {
                             refs.push(@freevar_entry {
                                 def: def,
                                 span: expr.span,
diff --git a/src/librustc/middle/kind.rs b/src/librustc/middle/kind.rs
index 767985b8fa3..09232a2a0c5 100644
--- a/src/librustc/middle/kind.rs
+++ b/src/librustc/middle/kind.rs
@@ -24,7 +24,7 @@ use util::ppaux::{ty_to_str, tys_to_str};
 use core::option;
 use core::str;
 use core::vec;
-use std::map::HashMap;
+use std::oldmap::HashMap;
 use syntax::ast::*;
 use syntax::codemap::{span, spanned};
 use syntax::print::pprust::expr_to_str;
diff --git a/src/librustc/middle/lang_items.rs b/src/librustc/middle/lang_items.rs
index 6d691438359..3eb65505e64 100644
--- a/src/librustc/middle/lang_items.rs
+++ b/src/librustc/middle/lang_items.rs
@@ -33,7 +33,7 @@ use syntax::visit::{default_simple_visitor, mk_simple_visitor, SimpleVisitor};
 use syntax::visit::{visit_crate, visit_item};
 
 use core::ptr;
-use std::map::HashMap;
+use std::oldmap::HashMap;
 use str_eq = str::eq;
 
 pub enum LangItem {
@@ -391,7 +391,7 @@ impl LanguageItemCollector {
     }
 
     fn check_completeness() {
-        for self.item_refs.each |key, item_ref| {
+        for self.item_refs.each_ref |&key, &item_ref| {
             match self.items.items[item_ref] {
                 None => {
                     self.session.err(fmt!("no item found for `%s`", key));
diff --git a/src/librustc/middle/lint.rs b/src/librustc/middle/lint.rs
index bd02c49ccba..0dc7a746e9e 100644
--- a/src/librustc/middle/lint.rs
+++ b/src/librustc/middle/lint.rs
@@ -32,8 +32,8 @@ use core::u32;
 use core::u64;
 use core::uint;
 use core::vec;
-use std::map::{Map, HashMap};
-use std::map;
+use std::oldmap::{Map, HashMap};
+use std::oldmap;
 use std::oldsmallintmap::{Map, SmallIntMap};
 use std::oldsmallintmap;
 use syntax::ast_util::{path_to_ident};
@@ -233,7 +233,7 @@ pub fn get_lint_dict() -> lint_dict {
            default: warn}),
         */
     ];
-    map::hash_from_vec(v)
+    oldmap::hash_from_vec(v)
 }
 
 // This is a highly not-optimal set of data structure decisions.
@@ -400,7 +400,9 @@ pub fn build_settings_crate(sess: session::Session, crate: @ast::crate) {
                     sess: sess});
 
     // Install defaults.
-    for cx.dict.each |_k, spec| { cx.set_level(spec.lint, spec.default); }
+    for cx.dict.each_value_ref |&spec| {
+        cx.set_level(spec.lint, spec.default);
+    }
 
     // Install command-line options, overriding defaults.
     for sess.opts.lint_opts.each |pair| {
diff --git a/src/librustc/middle/liveness.rs b/src/librustc/middle/liveness.rs
index 47fd0b526a6..d14d58122a7 100644
--- a/src/librustc/middle/liveness.rs
+++ b/src/librustc/middle/liveness.rs
@@ -119,7 +119,7 @@ use core::ptr;
 use core::to_str;
 use core::uint;
 use core::vec;
-use std::map::HashMap;
+use std::oldmap::HashMap;
 use syntax::ast::*;
 use syntax::codemap::span;
 use syntax::parse::token::special_idents;
diff --git a/src/librustc/middle/mem_categorization.rs b/src/librustc/middle/mem_categorization.rs
index 85cae4a0e67..94fc63b75dd 100644
--- a/src/librustc/middle/mem_categorization.rs
+++ b/src/librustc/middle/mem_categorization.rs
@@ -348,7 +348,7 @@ pub impl &mem_categorization_ctxt {
         let expr_ty = tcx.ty(expr);
         match expr.node {
           ast::expr_unary(ast::deref, e_base) => {
-            if self.method_map.contains_key(expr.id) {
+            if self.method_map.contains_key_ref(&expr.id) {
                 return self.cat_rvalue(expr, expr_ty);
             }
 
@@ -357,7 +357,7 @@ pub impl &mem_categorization_ctxt {
           }
 
           ast::expr_field(base, f_name, _) => {
-            if self.method_map.contains_key(expr.id) {
+            if self.method_map.contains_key_ref(&expr.id) {
                 return self.cat_method_ref(expr, expr_ty);
             }
 
@@ -366,7 +366,7 @@ pub impl &mem_categorization_ctxt {
           }
 
           ast::expr_index(base, _) => {
-            if self.method_map.contains_key(expr.id) {
+            if self.method_map.contains_key_ref(&expr.id) {
                 return self.cat_rvalue(expr, expr_ty);
             }
 
diff --git a/src/librustc/middle/moves.rs b/src/librustc/middle/moves.rs
index 30812a67a7b..8adebdb4582 100644
--- a/src/librustc/middle/moves.rs
+++ b/src/librustc/middle/moves.rs
@@ -217,7 +217,7 @@ use util::ppaux;
 use util::common::indenter;
 
 use core::vec;
-use std::map::HashMap;
+use std::oldmap::HashMap;
 use syntax::ast::*;
 use syntax::ast_util;
 use syntax::visit;
@@ -640,7 +640,7 @@ impl VisitContext {
                                arg_exprs: &[@expr],
                                visitor: vt<VisitContext>) -> bool
     {
-        if !self.method_map.contains_key(expr.id) {
+        if !self.method_map.contains_key_ref(&expr.id) {
             return false;
         }
 
@@ -771,7 +771,7 @@ impl VisitContext {
             for arm.pats.each |pat| {
                 let mut found = false;
                 do pat_bindings(self.tcx.def_map, *pat) |_, node_id, _, _| {
-                    if moves_map.contains_key(node_id) {
+                    if moves_map.contains_key_ref(&node_id) {
                         found = true;
                     }
                 }
diff --git a/src/librustc/middle/pat_util.rs b/src/librustc/middle/pat_util.rs
index 9de3dd2455b..c39d750a581 100644
--- a/src/librustc/middle/pat_util.rs
+++ b/src/librustc/middle/pat_util.rs
@@ -18,7 +18,7 @@ use syntax::ast_util::{path_to_ident, walk_pat};
 use syntax::fold;
 use syntax::fold::*;
 use syntax::codemap::{span, respan};
-use std::map::HashMap;
+use std::oldmap::HashMap;
 
 pub type PatIdMap = HashMap<ident, node_id>;
 
diff --git a/src/librustc/middle/region.rs b/src/librustc/middle/region.rs
index 31ac2f0f676..4602d2aff4e 100644
--- a/src/librustc/middle/region.rs
+++ b/src/librustc/middle/region.rs
@@ -32,7 +32,7 @@ use core::dvec::DVec;
 use core::vec;
 use std::list;
 use std::list::list;
-use std::map::HashMap;
+use std::oldmap::HashMap;
 use syntax::ast_map;
 use syntax::codemap::span;
 use syntax::print::pprust;
@@ -296,7 +296,7 @@ pub fn resolve_expr(expr: @ast::expr, cx: ctxt, visitor: visit::vt<ctxt>) {
       _ => {}
     };
 
-    if new_cx.root_exprs.contains_key(expr.id) {
+    if new_cx.root_exprs.contains_key_ref(&expr.id) {
         new_cx.parent = Some(expr.id);
     }
 
@@ -833,7 +833,7 @@ pub fn determine_rp_in_crate(sess: Session,
 
     debug!("%s", {
         debug!("Region variance results:");
-        for cx.region_paramd_items.each |key, value| {
+        for cx.region_paramd_items.each_ref |&key, &value| {
             debug!("item %? (%s) is parameterized with variance %?",
                    key,
                    ast_map::node_id_to_str(ast_map, key,
diff --git a/src/librustc/middle/resolve.rs b/src/librustc/middle/resolve.rs
index 09886913bc5..c40b6df6926 100644
--- a/src/librustc/middle/resolve.rs
+++ b/src/librustc/middle/resolve.rs
@@ -79,7 +79,7 @@ use str::{connect, split_str};
 use vec::pop;
 
 use std::list::{Cons, List, Nil};
-use std::map::HashMap;
+use std::oldmap::HashMap;
 use str_eq = str::eq;
 
 // Definition mapping
@@ -1913,7 +1913,7 @@ pub impl Resolver {
                self.module_to_str(module_));
         self.resolve_imports_for_module(module_);
 
-        for module_.children.each |_name, child_node| {
+        for module_.children.each_value_ref |&child_node| {
             match child_node.get_module_if_available() {
                 None => {
                     // Nothing to do.
@@ -1924,7 +1924,7 @@ pub impl Resolver {
             }
         }
 
-        for module_.anonymous_children.each |_block_id, child_module| {
+        for module_.anonymous_children.each_value_ref |&child_module| {
             self.resolve_imports_for_module_subtree(child_module);
         }
     }
@@ -2211,7 +2211,7 @@ pub impl Resolver {
         }
 
         // We've successfully resolved the import. Write the results in.
-        assert module_.import_resolutions.contains_key(target);
+        assert module_.import_resolutions.contains_key_ref(&target);
         let import_resolution = module_.import_resolutions.get(target);
 
         match value_result {
@@ -2370,7 +2370,7 @@ pub impl Resolver {
         }
 
         // We've successfully resolved the import. Write the results in.
-        assert module_.import_resolutions.contains_key(target);
+        assert module_.import_resolutions.contains_key_ref(&target);
         let import_resolution = module_.import_resolutions.get(target);
 
         match module_result {
@@ -2430,8 +2430,8 @@ pub impl Resolver {
         assert containing_module.glob_count == 0;
 
         // Add all resolved imports from the containing module.
-        for containing_module.import_resolutions.each
-                |ident, target_import_resolution| {
+        for containing_module.import_resolutions.each_ref
+                |&ident, &target_import_resolution| {
 
             debug!("(resolving glob import) writing module resolution \
                     %? into `%s`",
@@ -2480,7 +2480,7 @@ pub impl Resolver {
         }
 
         // Add all children from the containing module.
-        for containing_module.children.each |ident, name_bindings| {
+        for containing_module.children.each_ref |&ident, &name_bindings| {
             let mut dest_import_resolution;
             match module_.import_resolutions.find(ident) {
                 None => {
@@ -3148,7 +3148,7 @@ pub impl Resolver {
         }
 
         // Descend into children and anonymous children.
-        for module_.children.each |_name, child_node| {
+        for module_.children.each_value_ref |&child_node| {
             match child_node.get_module_if_available() {
                 None => {
                     // Continue.
@@ -3159,7 +3159,7 @@ pub impl Resolver {
             }
         }
 
-        for module_.anonymous_children.each |_name, module_| {
+        for module_.anonymous_children.each_value_ref |&module_| {
             self.report_unresolved_imports(module_);
         }
     }
@@ -3204,7 +3204,7 @@ pub impl Resolver {
 
         self.record_exports_for_module(module_);
 
-        for module_.children.each |_ident, child_name_bindings| {
+        for module_.children.each_value_ref |&child_name_bindings| {
             match child_name_bindings.get_module_if_available() {
                 None => {
                     // Nothing to do.
@@ -3215,7 +3215,7 @@ pub impl Resolver {
             }
         }
 
-        for module_.anonymous_children.each |_node_id, child_module| {
+        for module_.anonymous_children.each_value_ref |&child_module| {
             self.record_exports_for_module_subtree(child_module);
         }
     }
@@ -4068,7 +4068,7 @@ pub impl Resolver {
         for arm.pats.eachi() |i, p| {
             let map_i = self.binding_mode_map(*p);
 
-            for map_0.each |key, binding_0| {
+            for map_0.each_ref |&key, &binding_0| {
                 match map_i.find(key) {
                   None => {
                     self.session.span_err(
@@ -4089,8 +4089,8 @@ pub impl Resolver {
                 }
             }
 
-            for map_i.each |key, binding| {
-                if !map_0.contains_key(key) {
+            for map_i.each_ref |&key, &binding| {
+                if !map_0.contains_key_ref(&key) {
                     self.session.span_err(
                         binding.span,
                         fmt!("variable `%s` from pattern #%u is \
@@ -4319,7 +4319,8 @@ pub impl Resolver {
 
                             match bindings_list {
                                 Some(bindings_list)
-                                if !bindings_list.contains_key(ident) => {
+                                if !bindings_list.contains_key_ref(&ident)
+                                    => {
                                     let last_rib = (*self.value_ribs).last();
                                     last_rib.bindings.insert(ident,
                                                              dl_def(def));
@@ -4391,16 +4392,19 @@ pub impl Resolver {
                 pat_struct(path, _, _) => {
                     match self.resolve_path(path, TypeNS, false, visitor) {
                         Some(def_ty(class_id))
-                                if self.structs.contains_key(class_id) => {
+                                if self.structs.contains_key_ref(&class_id)
+                                     => {
                             let class_def = def_struct(class_id);
                             self.record_def(pattern.id, class_def);
                         }
                         Some(definition @ def_struct(class_id))
-                                if self.structs.contains_key(class_id) => {
+                                if self.structs.contains_key_ref(&class_id)
+                                     => {
                             self.record_def(pattern.id, definition);
                         }
                         Some(definition @ def_variant(_, variant_id))
-                                if self.structs.contains_key(variant_id) => {
+                                if self.structs.contains_key_ref(&variant_id)
+                                     => {
                             self.record_def(pattern.id, definition);
                         }
                         result => {
@@ -4848,12 +4852,12 @@ pub impl Resolver {
 
                 match self.resolve_path(path, TypeNS, false, visitor) {
                     Some(def_ty(class_id)) | Some(def_struct(class_id))
-                            if self.structs.contains_key(class_id) => {
+                            if self.structs.contains_key_ref(&class_id) => {
                         let class_def = def_struct(class_id);
                         self.record_def(expr.id, class_def);
                     }
                     Some(definition @ def_variant(_, class_id))
-                            if self.structs.contains_key(class_id) => {
+                            if self.structs.contains_key_ref(&class_id) => {
                         self.record_def(expr.id, definition);
                     }
                     _ => {
@@ -4997,7 +5001,7 @@ pub impl Resolver {
             }
 
             // Look for trait children.
-            for search_module.children.each |_name, child_name_bindings| {
+            for search_module.children.each_value_ref |&child_name_bindings| {
                 match child_name_bindings.def_for_namespace(TypeNS) {
                     Some(def) => {
                         match def {
@@ -5017,8 +5021,8 @@ pub impl Resolver {
             }
 
             // Look for imports.
-            for search_module.import_resolutions.each
-                    |_ident, import_resolution| {
+            for search_module.import_resolutions.each_value_ref
+                    |&import_resolution| {
 
                 match import_resolution.target_for_namespace(TypeNS) {
                     None => {
@@ -5073,7 +5077,7 @@ pub impl Resolver {
                self.session.str_of(name));
 
         match self.trait_info.find(trait_def_id) {
-            Some(trait_info) if trait_info.contains_key(name) => {
+            Some(trait_info) if trait_info.contains_key_ref(&name) => {
                 debug!("(adding trait info if containing method) found trait \
                         %d:%d for method '%s'",
                        trait_def_id.crate,
@@ -5180,7 +5184,7 @@ pub impl Resolver {
 
         self.check_for_unused_imports_in_module(module_);
 
-        for module_.children.each |_ident, child_name_bindings| {
+        for module_.children.each_value_ref |&child_name_bindings| {
             match (*child_name_bindings).get_module_if_available() {
                 None => {
                     // Nothing to do.
@@ -5192,13 +5196,13 @@ pub impl Resolver {
             }
         }
 
-        for module_.anonymous_children.each |_node_id, child_module| {
+        for module_.anonymous_children.each_value_ref |&child_module| {
             self.check_for_unused_imports_in_module_subtree(child_module);
         }
     }
 
     fn check_for_unused_imports_in_module(module_: @Module) {
-        for module_.import_resolutions.each |_name, import_resolution| {
+        for module_.import_resolutions.each_value_ref |&import_resolution| {
             if !import_resolution.used {
                 match self.unused_import_lint_level {
                     warn => {
@@ -5257,12 +5261,12 @@ pub impl Resolver {
         debug!("Dump of module `%s`:", self.module_to_str(module_));
 
         debug!("Children:");
-        for module_.children.each |name, _child| {
+        for module_.children.each_key_ref |&name| {
             debug!("* %s", self.session.str_of(name));
         }
 
         debug!("Import resolutions:");
-        for module_.import_resolutions.each |name, import_resolution| {
+        for module_.import_resolutions.each_ref |&name, &import_resolution| {
             let mut value_repr;
             match (*import_resolution).target_for_namespace(ValueNS) {
                 None => { value_repr = ~""; }
diff --git a/src/librustc/middle/trans/_match.rs b/src/librustc/middle/trans/_match.rs
index 6f8db25a109..6913cf8e2f5 100644
--- a/src/librustc/middle/trans/_match.rs
+++ b/src/librustc/middle/trans/_match.rs
@@ -164,7 +164,7 @@ use util::common::indenter;
 
 use core::dvec::DVec;
 use core::dvec;
-use std::map::HashMap;
+use std::oldmap::HashMap;
 use syntax::ast::def_id;
 use syntax::ast;
 use syntax::ast_util::{dummy_sp, path_to_ident};
@@ -1085,7 +1085,7 @@ pub fn store_non_ref_bindings(bcx: block,
      */
 
     let mut bcx = bcx;
-    for data.bindings_map.each_value |binding_info| {
+    for data.bindings_map.each_value_ref |&binding_info| {
         match binding_info.trmode {
             TrByValue(is_move, lldest) => {
                 let llval = Load(bcx, binding_info.llmatch); // get a T*
@@ -1119,7 +1119,7 @@ pub fn insert_lllocals(bcx: block,
      * the `fcx.lllocals` map.  If add_cleans is true, then adds cleanups for
      * the bindings. */
 
-    for data.bindings_map.each_value |binding_info| {
+    for data.bindings_map.each_value_ref |&binding_info| {
         let llval = match binding_info.trmode {
             // By value bindings: use the stack slot that we
             // copied/moved the value into
@@ -1191,14 +1191,14 @@ pub fn compile_guard(bcx: block,
 
     fn drop_bindings(bcx: block, data: &ArmData) -> block {
         let mut bcx = bcx;
-        for data.bindings_map.each_value |binding_info| {
+        for data.bindings_map.each_value_ref |&binding_info| {
             match binding_info.trmode {
                 TrByValue(_, llval) => {
                     bcx = glue::drop_ty(bcx, llval, binding_info.ty);
                 }
                 TrByRef | TrByImplicitRef => {}
             }
-            bcx.fcx.lllocals.remove(binding_info.id);
+            bcx.fcx.lllocals.remove(&binding_info.id);
         }
         return bcx;
     }
@@ -1586,7 +1586,7 @@ pub fn trans_match_inner(scope_cx: block,
                     // but during matching we need to store a *T as explained
                     // above
                     let is_move =
-                        scope_cx.ccx().maps.moves_map.contains_key(p_id);
+                        scope_cx.ccx().maps.moves_map.contains_key_ref(&p_id);
                     llmatch = alloca(bcx, T_ptr(llvariable_ty));
                     trmode = TrByValue(is_move, alloca(bcx, llvariable_ty));
                 }
diff --git a/src/librustc/middle/trans/base.rs b/src/librustc/middle/trans/base.rs
index 5a8fe94a439..a858ecb520a 100644
--- a/src/librustc/middle/trans/base.rs
+++ b/src/librustc/middle/trans/base.rs
@@ -75,9 +75,9 @@ use core::libc::{c_uint, c_ulonglong};
 use core::option::{is_none, is_some};
 use core::option;
 use core::uint;
-use std::map::HashMap;
+use std::oldmap::HashMap;
 use std::oldsmallintmap;
-use std::{map, time, list};
+use std::{oldmap, time, list};
 use syntax::ast_map::{path, path_elt_to_str, path_mod, path_name};
 use syntax::ast_util::{def_id_of_def, local_def, path_to_ident};
 use syntax::attr;
@@ -169,8 +169,7 @@ pub fn get_extern_fn(externs: HashMap<~str, ValueRef>,
                      +name: ~str,
                      cc: lib::llvm::CallConv,
                      ty: TypeRef) -> ValueRef {
-    // XXX: Bad copy.
-    if externs.contains_key(copy name) { return externs.get(name); }
+    if externs.contains_key_ref(&name) { return externs.get(name); }
     // XXX: Bad copy.
     let f = decl_fn(llmod, copy name, cc, ty);
     externs.insert(name, f);
@@ -180,8 +179,7 @@ pub fn get_extern_fn(externs: HashMap<~str, ValueRef>,
 pub fn get_extern_const(externs: HashMap<~str, ValueRef>, llmod: ModuleRef,
                         +name: ~str, ty: TypeRef) -> ValueRef {
     unsafe {
-        // XXX: Bad copy.
-        if externs.contains_key(copy name) { return externs.get(name); }
+        if externs.contains_key_ref(&name) { return externs.get(name); }
         let c = str::as_c_str(name, |buf| {
             llvm::LLVMAddGlobal(llmod, ty, buf)
         });
@@ -451,7 +449,7 @@ pub fn set_glue_inlining(f: ValueRef, t: ty::t) {
 // silently mangles such symbols, breaking our linkage model.
 pub fn note_unique_llvm_symbol(ccx: @crate_ctxt, +sym: ~str) {
     // XXX: Bad copy.
-    if ccx.all_llvm_symbols.contains_key(copy sym) {
+    if ccx.all_llvm_symbols.contains_key_ref(&sym) {
         ccx.sess.bug(~"duplicate LLVM symbol: " + sym);
     }
     ccx.all_llvm_symbols.insert(sym, ());
@@ -2485,7 +2483,7 @@ pub fn get_item_val(ccx: @crate_ctxt, id: ast::node_id) -> ValueRef {
             ccx.sess.bug(~"get_item_val(): unexpected variant")
           }
         };
-        if !(exprt || ccx.reachable.contains_key(id)) {
+        if !(exprt || ccx.reachable.contains_key_ref(&id)) {
             lib::llvm::SetLinkage(val, lib::llvm::InternalLinkage);
         }
         ccx.item_vals.insert(id, val);
@@ -2798,7 +2796,7 @@ pub fn decl_gc_metadata(ccx: @crate_ctxt, llmod_id: ~str) {
 
 pub fn create_module_map(ccx: @crate_ctxt) -> ValueRef {
     let elttype = T_struct(~[ccx.int_type, ccx.int_type]);
-    let maptype = T_array(elttype, ccx.module_data.size() + 1u);
+    let maptype = T_array(elttype, ccx.module_data.len() + 1);
     let map = str::as_c_str(~"_rust_mod_map", |buf| {
         unsafe {
             llvm::LLVMAddGlobal(ccx.llmod, maptype, buf)
@@ -2808,7 +2806,7 @@ pub fn create_module_map(ccx: @crate_ctxt) -> ValueRef {
         lib::llvm::SetLinkage(map, lib::llvm::InternalLinkage);
     }
     let mut elts: ~[ValueRef] = ~[];
-    for ccx.module_data.each |key, val| {
+    for ccx.module_data.each_ref |&key, &val| {
         let elt = C_struct(~[p2i(ccx, C_cstr(ccx, key)),
                             p2i(ccx, val)]);
         elts.push(elt);
@@ -3016,7 +3014,7 @@ pub fn trans_crate(sess: session::Session,
               monomorphized: HashMap(),
               monomorphizing: HashMap(),
               type_use_cache: HashMap(),
-              vtables: map::HashMap(),
+              vtables: oldmap::HashMap(),
               const_cstr_cache: HashMap(),
               const_globals: HashMap(),
               const_values: HashMap(),
@@ -3089,7 +3087,7 @@ pub fn trans_crate(sess: session::Session,
         }
 
         if ccx.sess.count_llvm_insns() {
-            for ccx.stats.llvm_insns.each |k, v| {
+            for ccx.stats.llvm_insns.each_ref |&k, &v| {
                 io::println(fmt!("%-7u %s", v, k));
             }
         }
diff --git a/src/librustc/middle/trans/build.rs b/src/librustc/middle/trans/build.rs
index 5938823768c..79236433580 100644
--- a/src/librustc/middle/trans/build.rs
+++ b/src/librustc/middle/trans/build.rs
@@ -22,7 +22,7 @@ use core::cast;
 use core::libc;
 use core::str;
 use core::vec;
-use std::map::HashMap;
+use std::oldmap::HashMap;
 use syntax::codemap;
 
 pub fn terminate(cx: block, _: &str) {
diff --git a/src/librustc/middle/trans/callee.rs b/src/librustc/middle/trans/callee.rs
index b55b8b83f01..833cff80d2d 100644
--- a/src/librustc/middle/trans/callee.rs
+++ b/src/librustc/middle/trans/callee.rs
@@ -672,7 +672,8 @@ pub fn trans_arg_expr(bcx: block,
         // FIXME(#3548) use the adjustments table
         match autoref_arg {
             DoAutorefArg => {
-                assert !bcx.ccx().maps.moves_map.contains_key(arg_expr.id);
+                assert !bcx.ccx().maps.moves_map.contains_key_ref(
+                    &arg_expr.id);
                 val = arg_datum.to_ref_llval(bcx);
             }
             DontAutorefArg => {
@@ -682,16 +683,16 @@ pub fn trans_arg_expr(bcx: block,
                         // the explicit self code currently passes by-ref, it
                         // does not hold.
                         //
-                        //assert !bcx.ccx().maps.moves_map.contains_key(
-                        //    arg_expr.id);
+                        //assert !bcx.ccx().maps.moves_map.contains_key_ref(
+                        //    &arg_expr.id);
                         val = arg_datum.to_ref_llval(bcx);
                     }
 
                     ast::by_val => {
                         // NB: avoid running the take glue.
 
-                        assert !bcx.ccx().maps.moves_map.contains_key(
-                            arg_expr.id);
+                        assert !bcx.ccx().maps.moves_map.contains_key_ref(
+                            &arg_expr.id);
                         val = arg_datum.to_value_llval(bcx);
                     }
 
diff --git a/src/librustc/middle/trans/closure.rs b/src/librustc/middle/trans/closure.rs
index 52bb8f56218..9a115acbd8d 100644
--- a/src/librustc/middle/trans/closure.rs
+++ b/src/librustc/middle/trans/closure.rs
@@ -28,7 +28,7 @@ use middle::trans::type_of::*;
 use util::ppaux::ty_to_str;
 
 use core::libc::c_uint;
-use std::map::HashMap;
+use std::oldmap::HashMap;
 use syntax::ast;
 use syntax::ast_map::{path, path_mod, path_name};
 use syntax::ast_util;
diff --git a/src/librustc/middle/trans/common.rs b/src/librustc/middle/trans/common.rs
index 6a2618412b9..f21a3150a1c 100644
--- a/src/librustc/middle/trans/common.rs
+++ b/src/librustc/middle/trans/common.rs
@@ -53,7 +53,7 @@ use core::str;
 use core::to_bytes;
 use core::vec::raw::to_ptr;
 use core::vec;
-use std::map::{HashMap, Set};
+use std::oldmap::{HashMap, Set};
 use syntax::ast::ident;
 use syntax::ast_map::path;
 use syntax::codemap::span;
diff --git a/src/librustc/middle/trans/consts.rs b/src/librustc/middle/trans/consts.rs
index 947e67c9e43..b5652fed10e 100644
--- a/src/librustc/middle/trans/consts.rs
+++ b/src/librustc/middle/trans/consts.rs
@@ -126,7 +126,7 @@ pub fn get_const_val(cx: @crate_ctxt, def_id: ast::def_id) -> ValueRef {
     if !ast_util::is_local(def_id) {
         cx.tcx.sess.bug(~"cross-crate constants");
     }
-    if !cx.const_values.contains_key(def_id.node) {
+    if !cx.const_values.contains_key_ref(&def_id.node) {
         match cx.tcx.items.get(def_id.node) {
             ast_map::node_item(@ast::item {
                 node: ast::item_const(_, subexpr), _
diff --git a/src/librustc/middle/trans/controlflow.rs b/src/librustc/middle/trans/controlflow.rs
index 92ea60d1946..240c323965f 100644
--- a/src/librustc/middle/trans/controlflow.rs
+++ b/src/librustc/middle/trans/controlflow.rs
@@ -183,8 +183,7 @@ pub fn trans_log(log_ex: @ast::expr,
     // XXX: Bad copy.
     let modname = path_str(ccx.sess, copy modpath);
 
-    // XXX: Bad copy.
-    let global = if ccx.module_data.contains_key(copy modname) {
+    let global = if ccx.module_data.contains_key_ref(&modname) {
         ccx.module_data.get(modname)
     } else {
         let s = link::mangle_internal_name_by_path_and_seq(
diff --git a/src/librustc/middle/trans/datum.rs b/src/librustc/middle/trans/datum.rs
index 6498b69fbc0..c3bd34ececb 100644
--- a/src/librustc/middle/trans/datum.rs
+++ b/src/librustc/middle/trans/datum.rs
@@ -223,7 +223,7 @@ pub impl Datum {
          * `id` is located in the move table, but copies otherwise.
          */
 
-        if bcx.ccx().maps.moves_map.contains_key(id) {
+        if bcx.ccx().maps.moves_map.contains_key_ref(&id) {
             self.move_to(bcx, action, dst)
         } else {
             self.copy_to(bcx, action, dst)
diff --git a/src/librustc/middle/trans/debuginfo.rs b/src/librustc/middle/trans/debuginfo.rs
index a32280c5850..35abddfb85a 100644
--- a/src/librustc/middle/trans/debuginfo.rs
+++ b/src/librustc/middle/trans/debuginfo.rs
@@ -26,8 +26,8 @@ use util::ppaux::ty_to_str;
 use core::libc;
 use core::option;
 use core::sys;
-use std::map::HashMap;
-use std::map;
+use std::oldmap::HashMap;
+use std::oldmap;
 use syntax::ast::Ty;
 use syntax::codemap::{span, CharPos};
 use syntax::parse::token::ident_interner;
@@ -111,13 +111,13 @@ pub type debug_ctxt = {
 };
 
 pub fn mk_ctxt(+crate: ~str, intr: @ident_interner) -> debug_ctxt {
-    {llmetadata: map::HashMap(),
+    {llmetadata: oldmap::HashMap(),
      names: new_namegen(intr),
      crate_file: crate}
 }
 
 fn update_cache(cache: metadata_cache, mdtag: int, val: debug_metadata) {
-    let existing = if cache.contains_key(mdtag) {
+    let existing = if cache.contains_key_ref(&mdtag) {
         cache.get(mdtag)
     } else {
         ~[]
@@ -176,7 +176,7 @@ fn cached_metadata<T: Copy>(cache: metadata_cache,
                             eq_fn: fn(md: T) -> bool)
                          -> Option<T> {
     unsafe {
-        if cache.contains_key(mdtag) {
+        if cache.contains_key_ref(&mdtag) {
             let items = cache.get(mdtag);
             for items.each |item| {
                 let md: T = md_from_metadata::<T>(*item);
diff --git a/src/librustc/middle/trans/expr.rs b/src/librustc/middle/trans/expr.rs
index 75a627a4422..4cf449cd972 100644
--- a/src/librustc/middle/trans/expr.rs
+++ b/src/librustc/middle/trans/expr.rs
@@ -265,7 +265,7 @@ pub fn trans_to_datum(bcx: block, expr: @ast::expr) -> DatumBlock {
 }
 
 pub fn trans_into(bcx: block, expr: @ast::expr, dest: Dest) -> block {
-    if bcx.tcx().adjustments.contains_key(expr.id) {
+    if bcx.tcx().adjustments.contains_key_ref(&expr.id) {
         // use trans_to_datum, which is mildly less efficient but
         // which will perform the adjustments:
         let datumblock = trans_to_datum(bcx, expr);
@@ -426,7 +426,7 @@ fn trans_rvalue_datum_unadjusted(bcx: block, expr: @ast::expr) -> DatumBlock {
         }
         ast::expr_binary(op, lhs, rhs) => {
             // if overloaded, would be RvalueDpsExpr
-            assert !bcx.ccx().maps.method_map.contains_key(expr.id);
+            assert !bcx.ccx().maps.method_map.contains_key_ref(&expr.id);
 
             return trans_binary(bcx, expr, op, lhs, rhs);
         }
@@ -1243,7 +1243,7 @@ fn trans_unary_datum(bcx: block,
     assert op != ast::deref;
 
     // if overloaded, would be RvalueDpsExpr
-    assert !bcx.ccx().maps.method_map.contains_key(un_expr.id);
+    assert !bcx.ccx().maps.method_map.contains_key_ref(&un_expr.id);
 
     let un_ty = expr_ty(bcx, un_expr);
     let sub_ty = expr_ty(bcx, sub_expr);
diff --git a/src/librustc/middle/trans/glue.rs b/src/librustc/middle/trans/glue.rs
index 4e557082e61..849a718a52e 100644
--- a/src/librustc/middle/trans/glue.rs
+++ b/src/librustc/middle/trans/glue.rs
@@ -380,7 +380,7 @@ pub fn make_visit_glue(bcx: block, v: ValueRef, t: ty::t) {
     let _icx = bcx.insn_ctxt("make_visit_glue");
     let mut bcx = bcx;
     let ty_visitor_name = special_idents::ty_visitor;
-    assert bcx.ccx().tcx.intrinsic_defs.contains_key(ty_visitor_name);
+    assert bcx.ccx().tcx.intrinsic_defs.contains_key_ref(&ty_visitor_name);
     let (trait_id, ty) = bcx.ccx().tcx.intrinsic_defs.get(ty_visitor_name);
     let v = PointerCast(bcx, v, T_ptr(type_of::type_of(bcx.ccx(), ty)));
     bcx = reflect::emit_calls_to_trait_visit_ty(bcx, t, v, trait_id);
@@ -757,7 +757,7 @@ pub fn emit_tydescs(ccx: @crate_ctxt) {
     let _icx = ccx.insn_ctxt("emit_tydescs");
     // As of this point, allow no more tydescs to be created.
     ccx.finished_tydescs = true;
-    for ccx.tydescs.each |_key, val| {
+    for ccx.tydescs.each_value_ref |&val| {
         let glue_fn_ty = T_ptr(T_generic_glue_fn(ccx));
         let ti = val;
 
diff --git a/src/librustc/middle/trans/machine.rs b/src/librustc/middle/trans/machine.rs
index 7af3b7a0683..1b3e13cddab 100644
--- a/src/librustc/middle/trans/machine.rs
+++ b/src/librustc/middle/trans/machine.rs
@@ -178,7 +178,7 @@ pub fn llalign_of(cx: @crate_ctxt, t: TypeRef) -> ValueRef {
 
 // Computes the size of the data part of an enum.
 pub fn static_size_of_enum(cx: @crate_ctxt, t: ty::t) -> uint {
-    if cx.enum_sizes.contains_key(t) { return cx.enum_sizes.get(t); }
+    if cx.enum_sizes.contains_key_ref(&t) { return cx.enum_sizes.get(t); }
     match ty::get(t).sty {
       ty::ty_enum(tid, ref substs) => {
         // Compute max(variant sizes).
diff --git a/src/librustc/middle/trans/meth.rs b/src/librustc/middle/trans/meth.rs
index 5a5644fefb9..f488c32437c 100644
--- a/src/librustc/middle/trans/meth.rs
+++ b/src/librustc/middle/trans/meth.rs
@@ -33,7 +33,7 @@ use middle::typeck;
 use util::ppaux::{ty_to_str, tys_to_str};
 
 use core::libc::c_uint;
-use std::map::HashMap;
+use std::oldmap::HashMap;
 use syntax::ast_map::{path, path_mod, path_name, node_id_to_str};
 use syntax::ast_util::local_def;
 use syntax::print::pprust::expr_to_str;
@@ -871,7 +871,7 @@ pub fn trans_trait_cast(bcx: block,
     match vstore {
         ty::vstore_slice(*) | ty::vstore_box => {
             let mut llboxdest = GEPi(bcx, lldest, [0u, 1u]);
-            if bcx.tcx().legacy_boxed_traits.contains_key(id) {
+            if bcx.tcx().legacy_boxed_traits.contains_key_ref(&id) {
                 // Allocate an @ box and store the value into it
                 let {bcx: new_bcx, box: llbox, body: body} =
                     malloc_boxed(bcx, v_ty);
diff --git a/src/librustc/middle/trans/reachable.rs b/src/librustc/middle/trans/reachable.rs
index b6e29b0d07a..02e07e8484a 100644
--- a/src/librustc/middle/trans/reachable.rs
+++ b/src/librustc/middle/trans/reachable.rs
@@ -22,7 +22,7 @@ use middle::ty;
 use middle::typeck;
 
 use core::vec;
-use std::map::HashMap;
+use std::oldmap::HashMap;
 use syntax::ast::*;
 use syntax::ast_util::def_id_of_def;
 use syntax::attr;
@@ -95,7 +95,7 @@ fn traverse_public_mod(cx: ctx, mod_id: node_id, m: _mod) {
 }
 
 fn traverse_public_item(cx: ctx, item: @item) {
-    if cx.rmap.contains_key(item.id) { return; }
+    if cx.rmap.contains_key_ref(&item.id) { return; }
     cx.rmap.insert(item.id, ());
     match /*bad*/copy item.node {
       item_mod(m) => traverse_public_mod(cx, item.id, m),
@@ -145,7 +145,7 @@ fn mk_ty_visitor() -> visit::vt<ctx> {
 }
 
 fn traverse_ty(ty: @Ty, cx: ctx, v: visit::vt<ctx>) {
-    if cx.rmap.contains_key(ty.id) { return; }
+    if cx.rmap.contains_key_ref(&ty.id) { return; }
     cx.rmap.insert(ty.id, ());
 
     match ty.node {
diff --git a/src/librustc/middle/trans/reflect.rs b/src/librustc/middle/trans/reflect.rs
index 26ea47d7e73..b9a055ad8ab 100644
--- a/src/librustc/middle/trans/reflect.rs
+++ b/src/librustc/middle/trans/reflect.rs
@@ -24,7 +24,7 @@ use middle::trans::meth;
 use middle::trans::type_of::*;
 use util::ppaux::ty_to_str;
 
-use std::map::HashMap;
+use std::oldmap::HashMap;
 use syntax::ast::def_id;
 use syntax::ast;
 
@@ -316,7 +316,7 @@ pub fn emit_calls_to_trait_visit_ty(bcx: block,
                                  -> block {
     use syntax::parse::token::special_idents::tydesc;
     let final = sub_block(bcx, ~"final");
-    assert bcx.ccx().tcx.intrinsic_defs.contains_key(tydesc);
+    assert bcx.ccx().tcx.intrinsic_defs.contains_key_ref(&tydesc);
     let (_, tydesc_ty) = bcx.ccx().tcx.intrinsic_defs.get(tydesc);
     let tydesc_ty = type_of::type_of(bcx.ccx(), tydesc_ty);
     let r = reflector({
diff --git a/src/librustc/middle/trans/shape.rs b/src/librustc/middle/trans/shape.rs
index 6d4ca428488..4f0e59b723e 100644
--- a/src/librustc/middle/trans/shape.rs
+++ b/src/librustc/middle/trans/shape.rs
@@ -26,7 +26,7 @@ use util::ppaux::ty_to_str;
 use core::dvec::DVec;
 use core::option::is_some;
 use core::vec;
-use std::map::HashMap;
+use std::oldmap::HashMap;
 use syntax::ast;
 use syntax::codemap::dummy_sp;
 use syntax::codemap::span;
diff --git a/src/librustc/middle/trans/type_of.rs b/src/librustc/middle/trans/type_of.rs
index 6f183aa50b0..72efab0c371 100644
--- a/src/librustc/middle/trans/type_of.rs
+++ b/src/librustc/middle/trans/type_of.rs
@@ -17,7 +17,7 @@ use middle::trans::expr;
 use middle::trans::machine;
 use util::ppaux;
 
-use std::map::HashMap;
+use std::oldmap::HashMap;
 use syntax::ast;
 
 pub fn type_of_explicit_arg(ccx: @crate_ctxt, arg: ty::arg) -> TypeRef {
@@ -87,7 +87,7 @@ pub fn type_of(cx: @crate_ctxt, t: ty::t) -> TypeRef {
     debug!("type_of %?: %?", t, ty::get(t));
 
     // Check the cache.
-    if cx.lltypes.contains_key(t) { return cx.lltypes.get(t); }
+    if cx.lltypes.contains_key_ref(&t) { return cx.lltypes.get(t); }
 
     // Replace any typedef'd types with their equivalent non-typedef
     // type. This ensures that all LLVM nominal types that contain
diff --git a/src/librustc/middle/trans/type_use.rs b/src/librustc/middle/trans/type_use.rs
index baf84436eab..350b1393c33 100644
--- a/src/librustc/middle/trans/type_use.rs
+++ b/src/librustc/middle/trans/type_use.rs
@@ -38,7 +38,7 @@ use core::uint;
 use core::vec;
 use std::list::{List, Cons, Nil};
 use std::list;
-use std::map::HashMap;
+use std::oldmap::HashMap;
 use syntax::ast::*;
 use syntax::ast_map;
 use syntax::ast_util;
diff --git a/src/librustc/middle/ty.rs b/src/librustc/middle/ty.rs
index 1fd082bb65c..4a0448c0b24 100644
--- a/src/librustc/middle/ty.rs
+++ b/src/librustc/middle/ty.rs
@@ -41,8 +41,8 @@ use core::result;
 use core::to_bytes;
 use core::uint;
 use core::vec;
-use std::map::HashMap;
-use std::{map, oldsmallintmap};
+use std::oldmap::HashMap;
+use std::{oldmap, oldsmallintmap};
 use syntax::ast::*;
 use syntax::ast_util::{is_local, local_def};
 use syntax::ast_util;
@@ -790,11 +790,11 @@ pub type node_type_table = @oldsmallintmap::SmallIntMap<t>;
 
 fn mk_rcache() -> creader_cache {
     type val = {cnum: int, pos: uint, len: uint};
-    return map::HashMap();
+    return oldmap::HashMap();
 }
 
-pub fn new_ty_hash<V: Copy>() -> map::HashMap<t, V> {
-    map::HashMap()
+pub fn new_ty_hash<V: Copy>() -> oldmap::HashMap<t, V> {
+    oldmap::HashMap()
 }
 
 pub fn mk_ctxt(s: session::Session,
@@ -822,7 +822,7 @@ pub fn mk_ctxt(s: session::Session,
         }
     }
 
-    let interner = map::HashMap();
+    let interner = oldmap::HashMap();
     let vecs_implicitly_copyable =
         get_lint_level(s.lint_settings.default_settings,
                        lint::vecs_implicitly_copyable) == allow;
@@ -839,9 +839,9 @@ pub fn mk_ctxt(s: session::Session,
         region_map: region_map,
         region_paramd_items: region_paramd_items,
         node_types: @oldsmallintmap::mk(),
-        node_type_substs: map::HashMap(),
+        node_type_substs: oldmap::HashMap(),
         items: amap,
-        intrinsic_defs: map::HashMap(),
+        intrinsic_defs: oldmap::HashMap(),
         freevars: freevars,
         tcache: HashMap(),
         rcache: mk_rcache(),
@@ -1745,7 +1745,7 @@ pub fn type_needs_unwind_cleanup(cx: ctxt, ty: t) -> bool {
 }
 
 fn type_needs_unwind_cleanup_(cx: ctxt, ty: t,
-                              tycache: map::HashMap<t, ()>,
+                              tycache: oldmap::HashMap<t, ()>,
                               encountered_box: bool) -> bool {
 
     // Prevent infinite recursion
@@ -2795,11 +2795,11 @@ impl sty : to_bytes::IterBytes {
 }
 
 pub fn br_hashmap<V:Copy>() -> HashMap<bound_region, V> {
-    map::HashMap()
+    oldmap::HashMap()
 }
 
 pub fn node_id_to_type(cx: ctxt, id: ast::node_id) -> t {
-    //io::println(fmt!("%?/%?", id, cx.node_types.size()));
+    //io::println(fmt!("%?/%?", id, cx.node_types.len()));
     match oldsmallintmap::find(*cx.node_types, id as uint) {
        Some(t) => t,
        None => cx.sess.bug(
@@ -2817,7 +2817,7 @@ pub fn node_id_to_type_params(cx: ctxt, id: ast::node_id) -> ~[t] {
 }
 
 fn node_id_has_type_params(cx: ctxt, id: ast::node_id) -> bool {
-    return cx.node_type_substs.contains_key(id);
+    return cx.node_type_substs.contains_key_ref(&id);
 }
 
 // Type accessors for substructures of types
@@ -3114,7 +3114,7 @@ pub enum ExprKind {
 pub fn expr_kind(tcx: ctxt,
                  method_map: typeck::method_map,
                  expr: @ast::expr) -> ExprKind {
-    if method_map.contains_key(expr.id) {
+    if method_map.contains_key_ref(&expr.id) {
         // Overloaded operations are generally calls, and hence they are
         // generated via DPS.  However, assign_op (e.g., `x += y`) is an
         // exception, as its result is always unit.
@@ -4359,7 +4359,7 @@ pub fn iter_bound_traits_and_supertraits(tcx: ctxt,
         if f(trait_ty) {
             // Add all the supertraits to the hash map,
             // executing <f> on each of them
-            while i < supertrait_map.size() && !fin {
+            while i < supertrait_map.len() && !fin {
                 let init_trait_id = seen_def_ids[i];
                 i += 1;
                  // Add supertraits to supertrait_map
@@ -4368,7 +4368,7 @@ pub fn iter_bound_traits_and_supertraits(tcx: ctxt,
                     let super_t = supertrait.tpt.ty;
                     let d_id = ty_to_def_id(super_t).expect("supertrait \
                         should be a trait ty");
-                    if !supertrait_map.contains_key(d_id) {
+                    if !supertrait_map.contains_key_ref(&d_id) {
                         supertrait_map.insert(d_id, super_t);
                         trait_ty = super_t;
                         seen_def_ids.push(d_id);
diff --git a/src/librustc/middle/typeck/check/_match.rs b/src/librustc/middle/typeck/check/_match.rs
index 33250c294e0..3e898ce3aa6 100644
--- a/src/librustc/middle/typeck/check/_match.rs
+++ b/src/librustc/middle/typeck/check/_match.rs
@@ -20,7 +20,7 @@ use middle::typeck::check::{structure_of, valid_range_bounds};
 use middle::typeck::require_same_types;
 
 use core::vec;
-use std::map::HashMap;
+use std::oldmap::HashMap;
 use syntax::ast;
 use syntax::ast_util::walk_pat;
 use syntax::ast_util;
@@ -239,7 +239,7 @@ pub fn check_struct_pat_fields(pcx: pat_ctxt,
     // Report an error if not all the fields were specified.
     if !etc {
         for class_fields.eachi |i, field| {
-            if found_fields.contains_key(i) {
+            if found_fields.contains_key_ref(&i) {
                 loop;
             }
             tcx.sess.span_err(span,
diff --git a/src/librustc/middle/typeck/check/method.rs b/src/librustc/middle/typeck/check/method.rs
index 7f82e916d74..5a12f9fc3a1 100644
--- a/src/librustc/middle/typeck/check/method.rs
+++ b/src/librustc/middle/typeck/check/method.rs
@@ -101,7 +101,7 @@ use core::dvec::DVec;
 use core::result;
 use core::uint;
 use core::vec;
-use std::map::HashMap;
+use std::oldmap::HashMap;
 use syntax::ast::{def_id, sty_by_ref, sty_value, sty_region, sty_box};
 use syntax::ast::{sty_uniq, sty_static, node_id, by_copy, by_ref};
 use syntax::ast::{m_const, m_mutbl, m_imm};
@@ -1171,11 +1171,12 @@ pub impl LookupContext {
         match candidate.origin {
             method_static(method_id) | method_self(method_id, _)
                 | method_super(method_id, _) => {
-                bad = self.tcx().destructors.contains_key(method_id);
+                bad = self.tcx().destructors.contains_key_ref(&method_id);
             }
             method_param(method_param { trait_id: trait_id, _ }) |
             method_trait(trait_id, _, _) => {
-                bad = self.tcx().destructor_for_type.contains_key(trait_id);
+                bad = self.tcx().destructor_for_type.contains_key_ref(
+                    &trait_id);
             }
         }
 
diff --git a/src/librustc/middle/typeck/check/mod.rs b/src/librustc/middle/typeck/check/mod.rs
index 5eb33629370..f3abfe3282a 100644
--- a/src/librustc/middle/typeck/check/mod.rs
+++ b/src/librustc/middle/typeck/check/mod.rs
@@ -115,8 +115,8 @@ use core::result;
 use core::str;
 use core::vec;
 use std::list::Nil;
-use std::map::HashMap;
-use std::map;
+use std::oldmap::HashMap;
+use std::oldmap;
 use syntax::ast::{provided, required, ty_i};
 use syntax::ast;
 use syntax::ast_map;
@@ -209,9 +209,9 @@ pub fn blank_inherited(ccx: @crate_ctxt) -> @inherited {
     @inherited {
         infcx: infer::new_infer_ctxt(ccx.tcx),
         locals: HashMap(),
-        node_types: map::HashMap(),
-        node_type_substs: map::HashMap(),
-        adjustments: map::HashMap()
+        node_types: oldmap::HashMap(),
+        node_type_substs: oldmap::HashMap(),
+        adjustments: oldmap::HashMap()
     }
 }
 
@@ -3078,8 +3078,8 @@ pub fn check_intrinsic_type(ccx: @crate_ctxt, it: @ast::foreign_item) {
       ~"visit_tydesc" => {
           let tydesc_name = special_idents::tydesc;
           let ty_visitor_name = tcx.sess.ident_of(~"TyVisitor");
-          assert tcx.intrinsic_defs.contains_key(tydesc_name);
-          assert ccx.tcx.intrinsic_defs.contains_key(ty_visitor_name);
+          assert tcx.intrinsic_defs.contains_key_ref(&tydesc_name);
+          assert ccx.tcx.intrinsic_defs.contains_key_ref(&ty_visitor_name);
           let (_, tydesc_ty) = tcx.intrinsic_defs.get(tydesc_name);
           let (_, visitor_trait) = tcx.intrinsic_defs.get(ty_visitor_name);
           let td_ptr = ty::mk_ptr(ccx.tcx, ty::mt {ty: tydesc_ty,
diff --git a/src/librustc/middle/typeck/check/regionck.rs b/src/librustc/middle/typeck/check/regionck.rs
index 89e156f2741..9ae55d4556b 100644
--- a/src/librustc/middle/typeck/check/regionck.rs
+++ b/src/librustc/middle/typeck/check/regionck.rs
@@ -211,7 +211,7 @@ pub fn visit_expr(expr: @ast::expr, &&rcx: @rcx, v: rvt) {
             // `constrain_auto_ref()` on all exprs.  But that causes a
             // lot of spurious errors because of how the region
             // hierarchy is setup.
-            if rcx.fcx.ccx.method_map.contains_key(callee.id) {
+            if rcx.fcx.ccx.method_map.contains_key_ref(&callee.id) {
                 match callee.node {
                     ast::expr_field(base, _, _) => {
                         constrain_auto_ref(rcx, base);
@@ -750,7 +750,7 @@ pub mod guarantor {
         let _i = ::util::common::indenter();
 
         let guarantor = {
-            if rcx.fcx.ccx.method_map.contains_key(expr.id) {
+            if rcx.fcx.ccx.method_map.contains_key_ref(&expr.id) {
                 None
             } else {
                 guarantor(rcx, expr)
diff --git a/src/librustc/middle/typeck/check/vtable.rs b/src/librustc/middle/typeck/check/vtable.rs
index 773ad73ce7a..18a4f20d031 100644
--- a/src/librustc/middle/typeck/check/vtable.rs
+++ b/src/librustc/middle/typeck/check/vtable.rs
@@ -28,7 +28,7 @@ use core::result;
 use core::uint;
 use core::vec;
 use result::{Result, Ok, Err};
-use std::map::HashMap;
+use std::oldmap::HashMap;
 use syntax::ast;
 use syntax::ast_util;
 use syntax::codemap::span;
@@ -268,7 +268,7 @@ pub fn lookup_vtable(vcx: &VtableContext,
                         // im is one specific impl of trait_ty.
 
                         // First, ensure we haven't processed this impl yet.
-                        if impls_seen.contains_key(im.did) {
+                        if impls_seen.contains_key_ref(&im.did) {
                             loop;
                         }
                         impls_seen.insert(im.did, ());
diff --git a/src/librustc/middle/typeck/check/writeback.rs b/src/librustc/middle/typeck/check/writeback.rs
index 8fe9b140406..64ea45c8704 100644
--- a/src/librustc/middle/typeck/check/writeback.rs
+++ b/src/librustc/middle/typeck/check/writeback.rs
@@ -28,7 +28,7 @@ use util::ppaux;
 
 use core::result::{Result, Ok, Err};
 use core::vec;
-use std::map::HashMap;
+use std::oldmap::HashMap;
 use syntax::ast;
 use syntax::codemap::span;
 use syntax::print::pprust::pat_to_str;
@@ -141,7 +141,7 @@ fn maybe_resolve_type_vars_for_node(wbcx: wb_ctxt, sp: span,
                                     id: ast::node_id)
     -> Option<ty::t>
 {
-    if wbcx.fcx.inh.node_types.contains_key(id) {
+    if wbcx.fcx.inh.node_types.contains_key_ref(&id) {
         resolve_type_vars_for_node(wbcx, sp, id)
     } else {
         None
diff --git a/src/librustc/middle/typeck/coherence.rs b/src/librustc/middle/typeck/coherence.rs
index 5be3414f24e..5ad8fd4c820 100644
--- a/src/librustc/middle/typeck/coherence.rs
+++ b/src/librustc/middle/typeck/coherence.rs
@@ -63,7 +63,7 @@ use core::uint::range;
 use core::uint;
 use core::vec::{len, push};
 use core::vec;
-use std::map::HashMap;
+use std::oldmap::HashMap;
 
 pub struct UniversalQuantificationResult {
     monotype: t,
@@ -417,7 +417,7 @@ pub impl CoherenceChecker {
         let coherence_info = &self.crate_context.coherence_info;
         let extension_methods = &coherence_info.extension_methods;
 
-        for extension_methods.each_key |trait_id| {
+        for extension_methods.each_key_ref |&trait_id| {
             self.check_implementation_coherence_of(trait_id);
         }
     }
@@ -502,7 +502,7 @@ pub impl CoherenceChecker {
         }
 
         for ty::trait_methods(tcx, trait_did).each |method| {
-            if provided_method_idents.contains_key(method.ident) {
+            if provided_method_idents.contains_key_ref(&method.ident) {
                 if !f(method) {
                     break;
                 }
@@ -912,7 +912,7 @@ pub impl CoherenceChecker {
         let tcx = self.crate_context.tcx;
         let pmm = tcx.provided_methods;
 
-        if pmm.contains_key(trait_def_id) { return; }
+        if pmm.contains_key_ref(&trait_def_id) { return; }
 
         debug!("(adding default methods for trait) processing trait");
 
diff --git a/src/librustc/middle/typeck/collect.rs b/src/librustc/middle/typeck/collect.rs
index 6a5c1fb53bc..32d92489188 100644
--- a/src/librustc/middle/typeck/collect.rs
+++ b/src/librustc/middle/typeck/collect.rs
@@ -326,7 +326,7 @@ pub fn ensure_supertraits(ccx: @crate_ctxt,
                           rp: Option<ty::region_variance>,
                           trait_refs: &[@ast::trait_ref]) {
     let tcx = ccx.tcx;
-    if tcx.supertraits.contains_key(local_def(id)) { return; }
+    if tcx.supertraits.contains_key_ref(&local_def(id)) { return; }
 
     let instantiated = dvec::DVec();
     for trait_refs.each |trait_ref| {
diff --git a/src/librustc/middle/typeck/infer/mod.rs b/src/librustc/middle/typeck/infer/mod.rs
index d6146d94951..6140390a24e 100644
--- a/src/librustc/middle/typeck/infer/mod.rs
+++ b/src/librustc/middle/typeck/infer/mod.rs
@@ -280,7 +280,7 @@ use core::result::{Result, Ok, Err, map_vec, map_vec2, iter_vec2};
 use core::result;
 use core::vec;
 use std::list::Nil;
-use std::map::HashMap;
+use std::oldmap::HashMap;
 use std::oldsmallintmap;
 use syntax::ast::{ret_style, purity};
 use syntax::ast::{m_const, m_imm, m_mutbl};
diff --git a/src/librustc/middle/typeck/infer/region_inference.rs b/src/librustc/middle/typeck/infer/region_inference.rs
index 5d602ab88bb..1a8e25239b3 100644
--- a/src/librustc/middle/typeck/infer/region_inference.rs
+++ b/src/librustc/middle/typeck/infer/region_inference.rs
@@ -559,7 +559,7 @@ use core::uint;
 use core::vec;
 use result::Result;
 use result::{Ok, Err};
-use std::map::HashMap;
+use std::oldmap::HashMap;
 use std::cell::{Cell, empty_cell};
 use std::list::{List, Nil, Cons};
 use syntax::codemap::span;
@@ -712,11 +712,11 @@ pub impl RegionVarBindings {
                 assert self.var_spans.len() == *vid + 1;
                 self.var_spans.pop();
               }
-              AddConstraint(constraint) => {
+              AddConstraint(ref constraint) => {
                 self.constraints.remove(constraint);
               }
               AddCombination(map, ref regions) => {
-                map.remove((*regions));
+                map.remove(regions);
               }
             }
         }
@@ -1226,7 +1226,7 @@ impl RegionVarBindings {
 
     fn construct_graph(&self) -> Graph {
         let num_vars = self.num_vars();
-        let num_edges = self.constraints.size();
+        let num_edges = self.constraints.len();
 
         let nodes = vec::from_fn(num_vars, |var_idx| {
             GraphNode {
diff --git a/src/librustc/middle/typeck/infer/test.rs b/src/librustc/middle/typeck/infer/test.rs
index eab7e80b3e6..416dcbcd30a 100644
--- a/src/librustc/middle/typeck/infer/test.rs
+++ b/src/librustc/middle/typeck/infer/test.rs
@@ -30,7 +30,7 @@ use std::getopts::groups;
 use std::getopts::{opt_present};
 use std::getopts;
 use std::getopts;
-use std::map::HashMap;
+use std::oldmap::HashMap;
 use syntax::codemap::dummy_sp;
 use syntax::parse::parse_crate_from_source_str;
 use syntax::{ast, attr, parse};
diff --git a/src/librustc/middle/typeck/mod.rs b/src/librustc/middle/typeck/mod.rs
index 2b230a30553..d292f04caa4 100644
--- a/src/librustc/middle/typeck/mod.rs
+++ b/src/librustc/middle/typeck/mod.rs
@@ -67,8 +67,8 @@ use core::result;
 use core::vec;
 use std::list::{List, Nil, Cons};
 use std::list;
-use std::map::HashMap;
-use std::map;
+use std::oldmap::HashMap;
+use std::oldmap;
 use std::oldsmallintmap;
 use syntax::ast::{provided, required};
 use syntax::ast_map::node_id_to_str;
@@ -377,8 +377,8 @@ pub fn check_crate(tcx: ty::ctxt,
 
     let ccx = @crate_ctxt_(crate_ctxt__ {
         trait_map: trait_map,
-        method_map: map::HashMap(),
-        vtable_map: map::HashMap(),
+        method_map: oldmap::HashMap(),
+        vtable_map: oldmap::HashMap(),
         coherence_info: @coherence::CoherenceInfo(),
         tcx: tcx
     });
diff --git a/src/librustc/rustc.rc b/src/librustc/rustc.rc
index 7ac719bd55e..99203d9d6a4 100644
--- a/src/librustc/rustc.rc
+++ b/src/librustc/rustc.rc
@@ -136,7 +136,7 @@ pub mod lib {
 use result::{Ok, Err};
 use io::ReaderUtil;
 use std::getopts;
-use std::map::HashMap;
+use std::oldmap::HashMap;
 use getopts::{opt_present};
 use getopts::groups;
 use syntax::codemap;
@@ -177,7 +177,7 @@ Available lint options:
 
     let lint_dict = lint::get_lint_dict();
     let mut max_key = 0;
-    for lint_dict.each_key |k| { max_key = uint::max(k.len(), max_key); }
+    for lint_dict.each_key_ref |&k| { max_key = uint::max(k.len(), max_key); }
     fn padded(max: uint, s: &str) -> ~str {
         str::from_bytes(vec::from_elem(max - s.len(), ' ' as u8)) + s
     }
@@ -186,7 +186,7 @@ Available lint options:
                      padded(max_key, ~"name"), ~"default", ~"meaning"));
     io::println(fmt!("    %s  %7.7s  %s\n",
                      padded(max_key, ~"----"), ~"-------", ~"-------"));
-    for lint_dict.each |k, v| {
+    for lint_dict.each_ref |&k, &v| {
         let k = str::replace(k, ~"_", ~"-");
         io::println(fmt!("    %s  %7.7s  %s",
                          padded(max_key, k),
diff --git a/src/librustc/util/common.rs b/src/librustc/util/common.rs
index 04cd9c4c03b..85f4ba94e5a 100644
--- a/src/librustc/util/common.rs
+++ b/src/librustc/util/common.rs
@@ -19,7 +19,7 @@ use syntax;
 use core::option;
 use core::str;
 use core::vec;
-use std::map::HashMap;
+use std::oldmap::HashMap;
 
 pub fn indent<R>(op: fn() -> R) -> R {
     // Use in conjunction with the log post-processor like `src/etc/indenter`
diff --git a/src/librustc/util/ppaux.rs b/src/librustc/util/ppaux.rs
index 10d49ad4b0f..2ed2d3ea5d7 100644
--- a/src/librustc/util/ppaux.rs
+++ b/src/librustc/util/ppaux.rs
@@ -36,7 +36,7 @@ use syntax::ast_map;
 
 use core::str;
 use core::vec;
-use std::map::HashMap;
+use std::oldmap::HashMap;
 
 pub fn note_and_explain_region(cx: ctxt,
                                prefix: ~str,
diff --git a/src/librustdoc/astsrv.rs b/src/librustdoc/astsrv.rs
index 09adc507a90..dd6e889008f 100644
--- a/src/librustdoc/astsrv.rs
+++ b/src/librustdoc/astsrv.rs
@@ -32,7 +32,7 @@ use rustc::driver::session::{basic_options, options};
 use rustc::driver::session;
 use rustc::front;
 use rustc::metadata::filesearch;
-use std::map::HashMap;
+use std::oldmap::HashMap;
 use syntax::ast;
 use syntax::ast_map;
 use syntax::codemap;
@@ -164,7 +164,7 @@ fn srv_should_build_ast_map() {
     let source = ~"fn a() { }";
     do from_str(source) |srv| {
         do exec(srv) |ctxt| {
-            assert ctxt.ast_map.size() != 0u
+            assert !ctxt.ast_map.is_empty()
         };
     }
 }
diff --git a/src/librustdoc/attr_pass.rs b/src/librustdoc/attr_pass.rs
index d4789ace703..0e70900520d 100644
--- a/src/librustdoc/attr_pass.rs
+++ b/src/librustdoc/attr_pass.rs
@@ -31,7 +31,7 @@ use core::option;
 use core::vec;
 use syntax::ast;
 use syntax::ast_map;
-use std::map::HashMap;
+use std::oldmap::HashMap;
 use std::par;
 
 pub fn mk_pass() -> Pass {
diff --git a/src/librustdoc/prune_hidden_pass.rs b/src/librustdoc/prune_hidden_pass.rs
index 6ca59b629ee..f039bb74583 100644
--- a/src/librustdoc/prune_hidden_pass.rs
+++ b/src/librustdoc/prune_hidden_pass.rs
@@ -19,7 +19,7 @@ use fold;
 use pass::Pass;
 
 use core::vec;
-use std::map::HashMap;
+use std::oldmap::HashMap;
 
 pub fn mk_pass() -> Pass {
     Pass {
diff --git a/src/librustdoc/tystr_pass.rs b/src/librustdoc/tystr_pass.rs
index 880e7ea1435..4ab40530cfb 100644
--- a/src/librustdoc/tystr_pass.rs
+++ b/src/librustdoc/tystr_pass.rs
@@ -22,7 +22,7 @@ use fold;
 use pass::Pass;
 
 use core::vec;
-use std::map::HashMap;
+use std::oldmap::HashMap;
 use std::par;
 use syntax::ast;
 use syntax::print::pprust;
diff --git a/src/libstd/json.rs b/src/libstd/json.rs
index b1cdeef4e66..b9e3b29b152 100644
--- a/src/libstd/json.rs
+++ b/src/libstd/json.rs
@@ -1162,18 +1162,6 @@ impl <A: ToJson Copy> LinearMap<~str, A>: ToJson {
     }
 }
 
-/*
-impl <A: ToJson Copy> @std::map::HashMap<~str, A>: ToJson {
-    fn to_json() -> Json {
-        let mut d = LinearMap::new();
-        for self.each_ref |key, value| {
-            d.insert(copy *key, value.to_json());
-        }
-        Object(~d)
-    }
-}
-*/
-
 impl <A: ToJson> Option<A>: ToJson {
     fn to_json() -> Json {
         match self {
diff --git a/src/libstd/map.rs b/src/libstd/oldmap.rs
similarity index 80%
rename from src/libstd/map.rs
rename to src/libstd/oldmap.rs
index d557a5a06da..d8fecda73a7 100644
--- a/src/libstd/map.rs
+++ b/src/libstd/oldmap.rs
@@ -8,16 +8,16 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-//! A map type
+//! A map type - **deprecated**, use `core::hashmap` instead
 #[forbid(deprecated_mode)];
 
+use core::container::{Container, Mutable, Map};
 use core::cmp::Eq;
 use core::hash::Hash;
 use core::io::WriterUtil;
 use core::io;
 use core::ops;
 use core::to_str::ToStr;
-use core::mutable::Mut;
 use core::prelude::*;
 use core::to_bytes::IterBytes;
 use core::uint;
@@ -28,84 +28,6 @@ pub type Set<K> = HashMap<K, ()>;
 
 pub type HashMap<K, V> = chained::T<K, V>;
 
-pub trait StdMap<K:Eq IterBytes Hash Copy, V: Copy> {
-    /// Return the number of elements in the map
-    pure fn size() -> uint;
-
-    /**
-     * Add a value to the map.
-     *
-     * If the map already contains a value for the specified key then the
-     * original value is replaced.
-     *
-     * Returns true if the key did not already exist in the map
-     */
-    fn insert(key: K, value: V) -> bool;
-
-    /**
-     * Add a value to the map.
-     *
-     * If the map contains a value for the key, use the function
-     * to set a new value.
-     */
-    fn update_with_key(key: K, newval: V, ff: fn(K, V, V) -> V) -> bool;
-
-    /**
-     * Add a value to the map.
-     *
-     * If the map contains a value for the key, use the function to
-     * set a new value.  (Like `update_with_key`, but with a
-     * function of only values.)
-     */
-    fn update(key: K, newval: V, ff: fn(V, V) -> V) -> bool;
-
-    /// Returns true if the map contains a value for the specified key
-    pure fn contains_key(key: K) -> bool;
-
-    /// Returns true if the map contains a value for the specified
-    /// key, taking the key by reference.
-    pure fn contains_key_ref(key: &K) -> bool;
-
-    /**
-     * Get the value for the specified key. Fails if the key does not exist in
-     * the map.
-     */
-    pure fn get(key: K) -> V;
-
-    /**
-     * Get the value for the specified key. If the key does not exist in
-     * the map then returns none.
-     */
-    pure fn find(key: K) -> Option<V>;
-
-    /**
-     * Remove and return a value from the map. Returns true if the
-     * key was present in the map, otherwise false.
-     */
-    fn remove(key: K) -> bool;
-
-    /// Clear the map, removing all key/value pairs.
-    fn clear();
-
-    /// Iterate over all the key/value pairs in the map by value
-    pure fn each(fn(key: K, value: V) -> bool);
-
-    /// Iterate over all the keys in the map by value
-    pure fn each_key(fn(key: K) -> bool);
-
-    /// Iterate over all the values in the map by value
-    pure fn each_value(fn(value: V) -> bool);
-
-    /// Iterate over all the key/value pairs in the map by reference
-    pure fn each_ref(fn(key: &K, value: &V) -> bool);
-
-    /// Iterate over all the keys in the map by reference
-    pure fn each_key_ref(fn(key: &K) -> bool);
-
-    /// Iterate over all the values in the map by reference
-    pure fn each_value_ref(fn(value: &V) -> bool);
-}
-
 pub mod util {
     pub struct Rational {
         // : int::positive(*.den);
@@ -124,7 +46,7 @@ pub mod util {
 // FIXME (#2344): package this up and export it as a datatype usable for
 // external code that doesn't want to pay the cost of a box.
 pub mod chained {
-    use map::{StdMap, util};
+    use super::util;
 
     use core::io;
     use core::ops;
@@ -239,14 +161,20 @@ pub mod chained {
         }
     }
 
-    impl<K:Eq IterBytes Hash Copy, V: Copy> T<K, V>: StdMap<K, V> {
-        pure fn size() -> uint { self.count }
+    impl<K: Eq IterBytes Hash, V> T<K, V>: Container {
+        pure fn len(&self) -> uint { self.count }
+        pure fn is_empty(&self) -> bool { self.count == 0 }
+    }
 
-        pure fn contains_key(k: K) -> bool {
-            self.contains_key_ref(&k)
+    impl<K: Eq IterBytes Hash, V> T<K, V>: Mutable {
+        fn clear(&mut self) {
+            self.count = 0u;
+            self.chains = chains(initial_capacity);
         }
+    }
 
-        pure fn contains_key_ref(k: &K) -> bool {
+    impl<K:Eq IterBytes Hash Copy, V: Copy> T<K, V> {
+        pure fn contains_key_ref(&self, k: &K) -> bool {
             let hash = k.hash_keyed(0,0) as uint;
             match self.search_tbl(k, hash) {
               NotFound => false,
@@ -298,7 +226,7 @@ pub mod chained {
             }
         }
 
-        pure fn find(k: K) -> Option<V> {
+        pure fn find(&self, k: K) -> Option<V> {
             unsafe {
                 match self.search_tbl(&k, k.hash_keyed(0,0) as uint) {
                   NotFound => None,
@@ -363,7 +291,7 @@ pub mod chained {
             return self.update_with_key(key, newval, |_k, v, v1| ff(v,v1));
         }
 
-        pure fn get(k: K) -> V {
+        pure fn get(&self, k: K) -> V {
             let opt_v = self.find(k);
             if opt_v.is_none() {
                 die!(fmt!("Key not found in table: %?", k));
@@ -371,8 +299,8 @@ pub mod chained {
             option::unwrap(move opt_v)
         }
 
-        fn remove(k: K) -> bool {
-            match self.search_tbl(&k, k.hash_keyed(0,0) as uint) {
+        fn remove(k: &K) -> bool {
+            match self.search_tbl(k, k.hash_keyed(0,0) as uint) {
               NotFound => false,
               FoundFirst(idx, entry) => {
                 self.count -= 1u;
@@ -387,34 +315,17 @@ pub mod chained {
             }
         }
 
-        fn clear() {
-            self.count = 0u;
-            self.chains = chains(initial_capacity);
-        }
-
-        pure fn each(blk: fn(key: K, value: V) -> bool) {
-            self.each_ref(|k, v| blk(*k, *v))
-        }
-
-        pure fn each_key(blk: fn(key: K) -> bool) {
-            self.each_key_ref(|p| blk(*p))
-        }
-
-        pure fn each_value(blk: fn(value: V) -> bool) {
-            self.each_value_ref(|p| blk(*p))
-        }
-
-        pure fn each_ref(blk: fn(key: &K, value: &V) -> bool) {
+        pure fn each_ref(&self, blk: fn(key: &K, value: &V) -> bool) {
             for self.each_entry |entry| {
                 if !blk(&entry.key, &entry.value) { break; }
             }
         }
 
-        pure fn each_key_ref(blk: fn(key: &K) -> bool) {
+        pure fn each_key_ref(&self, blk: fn(key: &K) -> bool) {
             self.each_ref(|k, _v| blk(k))
         }
 
-        pure fn each_value_ref(blk: fn(value: &V) -> bool) {
+        pure fn each_value_ref(&self, blk: fn(value: &V) -> bool) {
             self.each_ref(|_k, v| blk(v))
         }
     }
@@ -486,8 +397,8 @@ pub fn set_add<K:Eq IterBytes Hash Const Copy>(set: Set<K>, key: K) -> bool {
 
 /// Convert a set into a vector.
 pub pure fn vec_from_set<T:Eq IterBytes Hash Copy>(s: Set<T>) -> ~[T] {
-    do vec::build_sized(s.size()) |push| {
-        for s.each_key() |k| {
+    do vec::build_sized(s.len()) |push| {
+        for s.each_key_ref() |&k| {
             push(k);
         }
     }
@@ -509,20 +420,20 @@ pub fn hash_from_vec<K: Eq IterBytes Hash Const Copy, V: Copy>(
 
 #[cfg(test)]
 mod tests {
-    use map;
-
     use core::option::None;
     use core::option;
     use core::uint;
 
+    use super::*;
+
     #[test]
     fn test_simple() {
         debug!("*** starting test_simple");
         pure fn eq_uint(x: &uint, y: &uint) -> bool { *x == *y }
         pure fn uint_id(x: &uint) -> uint { *x }
         debug!("uint -> uint");
-        let hm_uu: map::HashMap<uint, uint> =
-            map::HashMap::<uint, uint>();
+        let hm_uu: HashMap<uint, uint> =
+            HashMap::<uint, uint>();
         assert (hm_uu.insert(10u, 12u));
         assert (hm_uu.insert(11u, 13u));
         assert (hm_uu.insert(12u, 14u));
@@ -537,8 +448,8 @@ mod tests {
         let eleven: ~str = ~"eleven";
         let twelve: ~str = ~"twelve";
         debug!("str -> uint");
-        let hm_su: map::HashMap<~str, uint> =
-            map::HashMap::<~str, uint>();
+        let hm_su: HashMap<~str, uint> =
+            HashMap::<~str, uint>();
         assert (hm_su.insert(~"ten", 12u));
         assert (hm_su.insert(eleven, 13u));
         assert (hm_su.insert(~"twelve", 14u));
@@ -551,8 +462,8 @@ mod tests {
         assert (!hm_su.insert(~"twelve", 12u));
         assert (hm_su.get(~"twelve") == 12u);
         debug!("uint -> str");
-        let hm_us: map::HashMap<uint, ~str> =
-            map::HashMap::<uint, ~str>();
+        let hm_us: HashMap<uint, ~str> =
+            HashMap::<uint, ~str>();
         assert (hm_us.insert(10u, ~"twelve"));
         assert (hm_us.insert(11u, ~"thirteen"));
         assert (hm_us.insert(12u, ~"fourteen"));
@@ -564,8 +475,8 @@ mod tests {
         assert (!hm_us.insert(12u, ~"twelve"));
         assert hm_us.get(12u) == ~"twelve";
         debug!("str -> str");
-        let hm_ss: map::HashMap<~str, ~str> =
-            map::HashMap::<~str, ~str>();
+        let hm_ss: HashMap<~str, ~str> =
+            HashMap::<~str, ~str>();
         assert (hm_ss.insert(ten, ~"twelve"));
         assert (hm_ss.insert(eleven, ~"thirteen"));
         assert (hm_ss.insert(twelve, ~"fourteen"));
@@ -590,8 +501,8 @@ mod tests {
         pure fn eq_uint(x: &uint, y: &uint) -> bool { *x == *y }
         pure fn uint_id(x: &uint) -> uint { *x }
         debug!("uint -> uint");
-        let hm_uu: map::HashMap<uint, uint> =
-            map::HashMap::<uint, uint>();
+        let hm_uu: HashMap<uint, uint> =
+            HashMap::<uint, uint>();
         let mut i: uint = 0u;
         while i < num_to_insert {
             assert (hm_uu.insert(i, i * i));
@@ -615,8 +526,8 @@ mod tests {
             i += 1u;
         }
         debug!("str -> str");
-        let hm_ss: map::HashMap<~str, ~str> =
-            map::HashMap::<~str, ~str>();
+        let hm_ss: HashMap<~str, ~str> =
+            HashMap::<~str, ~str>();
         i = 0u;
         while i < num_to_insert {
             assert hm_ss.insert(uint::to_str_radix(i, 2u),
@@ -657,24 +568,24 @@ mod tests {
     fn test_removal() {
         debug!("*** starting test_removal");
         let num_to_insert: uint = 64u;
-        let hm: map::HashMap<uint, uint> =
-            map::HashMap::<uint, uint>();
+        let hm: HashMap<uint, uint> =
+            HashMap::<uint, uint>();
         let mut i: uint = 0u;
         while i < num_to_insert {
             assert (hm.insert(i, i * i));
             debug!("inserting %u -> %u", i, i*i);
             i += 1u;
         }
-        assert (hm.size() == num_to_insert);
+        assert (hm.len() == num_to_insert);
         debug!("-----");
         debug!("removing evens");
         i = 0u;
         while i < num_to_insert {
-            let v = hm.remove(i);
+            let v = hm.remove(&i);
             assert v;
             i += 2u;
         }
-        assert (hm.size() == num_to_insert / 2u);
+        assert (hm.len() == num_to_insert / 2u);
         debug!("-----");
         i = 1u;
         while i < num_to_insert {
@@ -696,7 +607,7 @@ mod tests {
             debug!("inserting %u -> %u", i, i*i);
             i += 2u;
         }
-        assert (hm.size() == num_to_insert);
+        assert (hm.len() == num_to_insert);
         debug!("-----");
         i = 0u;
         while i < num_to_insert {
@@ -705,7 +616,7 @@ mod tests {
             i += 1u;
         }
         debug!("-----");
-        assert (hm.size() == num_to_insert);
+        assert (hm.len() == num_to_insert);
         i = 0u;
         while i < num_to_insert {
             debug!("get(%u) = %u", i, hm.get(i));
@@ -718,16 +629,16 @@ mod tests {
     #[test]
     fn test_contains_key() {
         let key = ~"k";
-        let map = map::HashMap::<~str, ~str>();
-        assert (!map.contains_key(key));
+        let map = HashMap::<~str, ~str>();
+        assert (!map.contains_key_ref(&key));
         map.insert(key, ~"val");
-        assert (map.contains_key(key));
+        assert (map.contains_key_ref(&key));
     }
 
     #[test]
     fn test_find() {
         let key = ~"k";
-        let map = map::HashMap::<~str, ~str>();
+        let map = HashMap::<~str, ~str>();
         assert (option::is_none(&map.find(key)));
         map.insert(key, ~"val");
         assert (option::get(map.find(key)) == ~"val");
@@ -736,23 +647,23 @@ mod tests {
     #[test]
     fn test_clear() {
         let key = ~"k";
-        let map = map::HashMap::<~str, ~str>();
+        let mut map = HashMap::<~str, ~str>();
         map.insert(key, ~"val");
-        assert (map.size() == 1);
-        assert (map.contains_key(key));
+        assert (map.len() == 1);
+        assert (map.contains_key_ref(&key));
         map.clear();
-        assert (map.size() == 0);
-        assert (!map.contains_key(key));
+        assert (map.len() == 0);
+        assert (!map.contains_key_ref(&key));
     }
 
     #[test]
     fn test_hash_from_vec() {
-        let map = map::hash_from_vec(~[
+        let map = hash_from_vec(~[
             (~"a", 1),
             (~"b", 2),
             (~"c", 3)
         ]);
-        assert map.size() == 3u;
+        assert map.len() == 3u;
         assert map.get(~"a") == 1;
         assert map.get(~"b") == 2;
         assert map.get(~"c") == 3;
@@ -760,7 +671,7 @@ mod tests {
 
     #[test]
     fn test_update_with_key() {
-        let map = map::HashMap::<~str, uint>();
+        let map = HashMap::<~str, uint>();
 
         // given a new key, initialize it with this new count, given
         // given an existing key, add more to its count
diff --git a/src/libstd/std.rc b/src/libstd/std.rc
index dc73b430099..65122bea750 100644
--- a/src/libstd/std.rc
+++ b/src/libstd/std.rc
@@ -79,7 +79,7 @@ pub mod bitv;
 pub mod deque;
 pub mod fun_treemap;
 pub mod list;
-pub mod map;
+pub mod oldmap;
 pub mod priority_queue;
 pub mod rope;
 pub mod smallintmap;
diff --git a/src/libsyntax/ast_map.rs b/src/libsyntax/ast_map.rs
index 759d3d2d824..e6a4639ad80 100644
--- a/src/libsyntax/ast_map.rs
+++ b/src/libsyntax/ast_map.rs
@@ -25,8 +25,8 @@ use core::cmp;
 use core::either;
 use core::str;
 use core::vec;
-use std::map::HashMap;
-use std::map;
+use std::oldmap::HashMap;
+use std::oldmap;
 use std;
 
 pub enum path_elt {
@@ -106,7 +106,7 @@ pub enum ast_node {
     node_struct_ctor(@struct_def, @item, @path),
 }
 
-pub type map = std::map::HashMap<node_id, ast_node>;
+pub type map = std::oldmap::HashMap<node_id, ast_node>;
 pub struct ctx {
     map: map,
     mut path: path,
@@ -134,7 +134,7 @@ pub fn mk_ast_map_visitor() -> vt {
 
 pub fn map_crate(diag: span_handler, c: crate) -> map {
     let cx = ctx {
-        map: std::map::HashMap(),
+        map: std::oldmap::HashMap(),
         mut path: ~[],
         mut local_id: 0u,
         diag: diag,
diff --git a/src/libsyntax/attr.rs b/src/libsyntax/attr.rs
index 30bd23d5936..c6c79f1289c 100644
--- a/src/libsyntax/attr.rs
+++ b/src/libsyntax/attr.rs
@@ -24,8 +24,8 @@ use core::either::Either;
 use core::either;
 use core::option;
 use core::vec;
-use std::map::HashMap;
-use std::map;
+use std::oldmap::HashMap;
+use std::oldmap;
 use std;
 
 /* Constructors */
@@ -358,12 +358,12 @@ pub fn find_inline_attr(attrs: &[ast::attribute]) -> inline_attr {
 
 pub fn require_unique_names(diagnostic: span_handler,
                             metas: &[@ast::meta_item]) {
-    let map = map::HashMap();
+    let map = oldmap::HashMap();
     for metas.each |meta| {
         let name = get_meta_item_name(*meta);
 
         // FIXME: How do I silence the warnings? --pcw (#2619)
-        if map.contains_key(name) {
+        if map.contains_key_ref(&name) {
             diagnostic.span_fatal(meta.span,
                                   fmt!("duplicate meta item `%s`", name));
         }
diff --git a/src/libsyntax/ext/auto_encode.rs b/src/libsyntax/ext/auto_encode.rs
index 622db9400be..03aa0cde811 100644
--- a/src/libsyntax/ext/auto_encode.rs
+++ b/src/libsyntax/ext/auto_encode.rs
@@ -98,8 +98,8 @@ use ext::base::*;
 use parse;
 
 use core::vec;
-use std::map;
-use std::map::HashMap;
+use std::oldmap;
+use std::oldmap::HashMap;
 
 // Transitional reexports so qquote can find the paths it is looking for
 mod syntax {
diff --git a/src/libsyntax/ext/base.rs b/src/libsyntax/ext/base.rs
index a37ce512ac1..3efae955965 100644
--- a/src/libsyntax/ext/base.rs
+++ b/src/libsyntax/ext/base.rs
@@ -20,7 +20,7 @@ use parse::{parser, token};
 
 use core::io;
 use core::vec;
-use std::map::HashMap;
+use std::oldmap::HashMap;
 
 // new-style macro! tt code:
 //
diff --git a/src/libsyntax/ext/expand.rs b/src/libsyntax/ext/expand.rs
index 1d9c87f4e95..227a86e0766 100644
--- a/src/libsyntax/ext/expand.rs
+++ b/src/libsyntax/ext/expand.rs
@@ -20,7 +20,7 @@ use parse::{parser, parse_expr_from_source_str, new_parser_from_tts};
 
 use core::option;
 use core::vec;
-use std::map::HashMap;
+use std::oldmap::HashMap;
 
 pub fn expand_expr(exts: HashMap<~str, SyntaxExtension>, cx: ext_ctxt,
                    e: expr_, s: span, fld: ast_fold,
diff --git a/src/libsyntax/ext/tt/macro_parser.rs b/src/libsyntax/ext/tt/macro_parser.rs
index a31af36cc54..9548db70b94 100644
--- a/src/libsyntax/ext/tt/macro_parser.rs
+++ b/src/libsyntax/ext/tt/macro_parser.rs
@@ -26,7 +26,7 @@ use core::option;
 use core::str;
 use core::uint;
 use core::vec;
-use std::map::HashMap;
+use std::oldmap::HashMap;
 
 /* This is an Earley-like parser, without support for in-grammar nonterminals,
 only by calling out to the main rust parser for named nonterminals (which it
@@ -197,7 +197,7 @@ pub fn nameize(p_s: parse_sess, ms: ~[matcher], res: ~[@named_match])
           codemap::spanned {
                 node: match_nonterminal(bind_name, _, idx), span: sp
           } => {
-            if ret_val.contains_key(bind_name) {
+            if ret_val.contains_key_ref(&bind_name) {
                 p_s.span_diagnostic.span_fatal(sp, ~"Duplicated bind name: "+
                                                *p_s.interner.get(bind_name))
             }
diff --git a/src/libsyntax/ext/tt/macro_rules.rs b/src/libsyntax/ext/tt/macro_rules.rs
index 115cb4f5f94..31172cbfa85 100644
--- a/src/libsyntax/ext/tt/macro_rules.rs
+++ b/src/libsyntax/ext/tt/macro_rules.rs
@@ -26,7 +26,7 @@ use parse::token::{FAT_ARROW, SEMI, LBRACE, RBRACE, nt_matchers, nt_tt};
 use print;
 
 use core::io;
-use std::map::HashMap;
+use std::oldmap::HashMap;
 
 pub fn add_new_extension(cx: ext_ctxt, sp: span, name: ident,
                          arg: ~[ast::token_tree]) -> base::MacResult {
diff --git a/src/libsyntax/ext/tt/transcribe.rs b/src/libsyntax/ext/tt/transcribe.rs
index 504a17237dc..6bf90617a6e 100644
--- a/src/libsyntax/ext/tt/transcribe.rs
+++ b/src/libsyntax/ext/tt/transcribe.rs
@@ -22,7 +22,7 @@ use parse::lexer::TokenAndSpan;
 use core::option;
 use core::vec;
 use std;
-use std::map::HashMap;
+use std::oldmap::HashMap;
 
 enum tt_frame_up { /* to break a circularity */
     tt_frame_up(Option<tt_frame>)
@@ -44,7 +44,7 @@ pub type tt_reader = @{
     interner: @ident_interner,
     mut cur: tt_frame,
     /* for MBE-style macro transcription */
-    interpolations: std::map::HashMap<ident, @named_match>,
+    interpolations: std::oldmap::HashMap<ident, @named_match>,
     mut repeat_idx: ~[uint],
     mut repeat_len: ~[uint],
     /* cached: */
@@ -56,14 +56,14 @@ pub type tt_reader = @{
  *  `src` contains no `tt_seq`s and `tt_nonterminal`s, `interp` can (and
  *  should) be none. */
 pub fn new_tt_reader(sp_diag: span_handler, itr: @ident_interner,
-                     interp: Option<std::map::HashMap<ident,@named_match>>,
+                     interp: Option<std::oldmap::HashMap<ident,@named_match>>,
                      src: ~[ast::token_tree])
                   -> tt_reader {
     let r = @{sp_diag: sp_diag, interner: itr,
               mut cur: @{readme: src, mut idx: 0u, dotdotdoted: false,
                          sep: None, up: tt_frame_up(option::None)},
               interpolations: match interp { /* just a convienience */
-                None => std::map::HashMap(),
+                None => std::oldmap::HashMap(),
                 Some(x) => x
               },
               mut repeat_idx: ~[],
diff --git a/src/libsyntax/parse/common.rs b/src/libsyntax/parse/common.rs
index 48ef6b873ec..d82a5a18039 100644
--- a/src/libsyntax/parse/common.rs
+++ b/src/libsyntax/parse/common.rs
@@ -18,7 +18,7 @@ use parse::token;
 
 use core::option::{None, Option, Some};
 use core::option;
-use std::map::HashMap;
+use std::oldmap::HashMap;
 
 pub type seq_sep = {
     sep: Option<token::Token>,
diff --git a/src/libsyntax/parse/obsolete.rs b/src/libsyntax/parse/obsolete.rs
index 0c7a202dcd6..cdde542bb1f 100644
--- a/src/libsyntax/parse/obsolete.rs
+++ b/src/libsyntax/parse/obsolete.rs
@@ -137,7 +137,7 @@ pub impl Parser {
                    desc: &str) {
         self.span_err(sp, fmt!("obsolete syntax: %s", kind_str));
 
-        if !self.obsolete_set.contains_key(kind) {
+        if !self.obsolete_set.contains_key_ref(&kind) {
             self.sess.span_diagnostic.handler().note(fmt!("%s", desc));
             self.obsolete_set.insert(kind, ());
         }
diff --git a/src/libsyntax/parse/parser.rs b/src/libsyntax/parse/parser.rs
index 06f86f134a6..3c7250112ab 100644
--- a/src/libsyntax/parse/parser.rs
+++ b/src/libsyntax/parse/parser.rs
@@ -87,7 +87,7 @@ use core::either;
 use core::result::Result;
 use core::vec::push;
 use core::vec;
-use std::map::HashMap;
+use std::oldmap::HashMap;
 
 #[deriving_eq]
 enum restriction {
diff --git a/src/libsyntax/parse/token.rs b/src/libsyntax/parse/token.rs
index 843b0edcfc9..2770d823bf3 100644
--- a/src/libsyntax/parse/token.rs
+++ b/src/libsyntax/parse/token.rs
@@ -21,7 +21,7 @@ use core::char;
 use core::cmp;
 use core::str;
 use core::task;
-use std::map::HashMap;
+use std::oldmap::HashMap;
 
 #[auto_encode]
 #[auto_decode]
@@ -454,13 +454,13 @@ pub fn mk_fake_ident_interner() -> @ident_interner {
  */
 pub fn keyword_table() -> HashMap<~str, ()> {
     let keywords = HashMap();
-    for temporary_keyword_table().each_key |word| {
+    for temporary_keyword_table().each_key_ref |&word| {
         keywords.insert(word, ());
     }
-    for strict_keyword_table().each_key |word| {
+    for strict_keyword_table().each_key_ref |&word| {
         keywords.insert(word, ());
     }
-    for reserved_keyword_table().each_key |word| {
+    for reserved_keyword_table().each_key_ref |&word| {
         keywords.insert(word, ());
     }
     keywords
diff --git a/src/libsyntax/util/interner.rs b/src/libsyntax/util/interner.rs
index 23db470391a..19b938ccd68 100644
--- a/src/libsyntax/util/interner.rs
+++ b/src/libsyntax/util/interner.rs
@@ -15,13 +15,13 @@
 use core::prelude::*;
 
 use core::dvec::DVec;
-use std::map::HashMap;
-use std::map;
+use std::oldmap::HashMap;
+use std::oldmap;
 
 pub type hash_interner<T> = {map: HashMap<T, uint>, vect: DVec<T>};
 
 pub fn mk<T:Eq IterBytes Hash Const Copy>() -> Interner<T> {
-    let m = map::HashMap::<T, uint>();
+    let m = oldmap::HashMap::<T, uint>();
     let hi: hash_interner<T> =
         {map: m, vect: DVec()};
     move ((move hi) as Interner::<T>)
diff --git a/src/test/auxiliary/issue-2631-a.rs b/src/test/auxiliary/issue-2631-a.rs
index 197ad840234..748c209229c 100644
--- a/src/test/auxiliary/issue-2631-a.rs
+++ b/src/test/auxiliary/issue-2631-a.rs
@@ -14,7 +14,7 @@
 extern mod std;
 
 use core::dvec::*;
-use std::map::HashMap;
+use std::oldmap::HashMap;
 
 pub type header_map = HashMap<~str, @DVec<@~str>>;
 
diff --git a/src/test/bench/core-map.rs b/src/test/bench/core-map.rs
index a61d8f01ab7..67c071da26d 100644
--- a/src/test/bench/core-map.rs
+++ b/src/test/bench/core-map.rs
@@ -9,7 +9,7 @@
 // except according to those terms.
 
 extern mod std;
-use std::map;
+use std::oldmap;
 use std::treemap::TreeMap;
 use core::hashmap::linear::*;
 use core::io::WriterUtil;
@@ -35,7 +35,7 @@ fn timed(result: &mut float,
 fn old_int_benchmarks(rng: @rand::Rng, num_keys: uint, results: &mut Results) {
 
     {
-        let map = map::HashMap();
+        let map = oldmap::HashMap();
         do timed(&mut results.sequential_ints) {
             for uint::range(0, num_keys) |i| {
                 map.insert(i, i+1);
@@ -48,7 +48,7 @@ fn old_int_benchmarks(rng: @rand::Rng, num_keys: uint, results: &mut Results) {
     }
 
     {
-        let map = map::HashMap();
+        let map = oldmap::HashMap();
         do timed(&mut results.random_ints) {
             for uint::range(0, num_keys) |i| {
                 map.insert(rng.next() as uint, i);
@@ -57,14 +57,14 @@ fn old_int_benchmarks(rng: @rand::Rng, num_keys: uint, results: &mut Results) {
     }
 
     {
-        let map = map::HashMap();
+        let map = oldmap::HashMap();
         for uint::range(0, num_keys) |i| {
             map.insert(i, i);;
         }
 
         do timed(&mut results.delete_ints) {
             for uint::range(0, num_keys) |i| {
-                assert map.remove(i);
+                assert map.remove(&i);
             }
         }
     }
@@ -72,7 +72,7 @@ fn old_int_benchmarks(rng: @rand::Rng, num_keys: uint, results: &mut Results) {
 
 fn old_str_benchmarks(rng: @rand::Rng, num_keys: uint, results: &mut Results) {
     {
-        let map = map::HashMap();
+        let map = oldmap::HashMap();
         do timed(&mut results.sequential_strings) {
             for uint::range(0, num_keys) |i| {
                 let s = uint::to_str(i);
@@ -87,7 +87,7 @@ fn old_str_benchmarks(rng: @rand::Rng, num_keys: uint, results: &mut Results) {
     }
 
     {
-        let map = map::HashMap();
+        let map = oldmap::HashMap();
         do timed(&mut results.random_strings) {
             for uint::range(0, num_keys) |i| {
                 let s = uint::to_str(rng.next() as uint);
@@ -97,13 +97,13 @@ fn old_str_benchmarks(rng: @rand::Rng, num_keys: uint, results: &mut Results) {
     }
 
     {
-        let map = map::HashMap();
+        let map = oldmap::HashMap();
         for uint::range(0, num_keys) |i| {
             map.insert(uint::to_str(i), i);
         }
         do timed(&mut results.delete_strings) {
             for uint::range(0, num_keys) |i| {
-                assert map.remove(uint::to_str(i));
+                assert map.remove(&uint::to_str(i));
             }
         }
     }
@@ -309,7 +309,7 @@ fn main() {
         let mut results = empty_results();
         old_int_benchmarks(rng, num_keys, &mut results);
         old_str_benchmarks(rng, num_keys, &mut results);
-        write_results("std::map::HashMap", &results);
+        write_results("std::oldmap::HashMap", &results);
     }
 
     {
diff --git a/src/test/bench/core-std.rs b/src/test/bench/core-std.rs
index bc20eddfda1..32b6c491898 100644
--- a/src/test/bench/core-std.rs
+++ b/src/test/bench/core-std.rs
@@ -13,8 +13,8 @@
 extern mod std;
 
 use std::time::precise_time_s;
-use std::map;
-use std::map::{Map, HashMap};
+use std::oldmap;
+use std::oldmap::{Map, HashMap};
 
 use io::{Reader, ReaderUtil};
 
@@ -75,12 +75,12 @@ fn read_line() {
 fn str_set() {
     let r = rand::Rng();
 
-    let s = map::HashMap();
+    let s = oldmap::HashMap();
 
     for int::range(0, 1000) |_i| {
-        map::set_add(s, r.gen_str(10));
+        oldmap::set_add(s, r.gen_str(10));
     }
-    
+
     let mut found = 0;
     for int::range(0, 1000) |_i| {
         match s.find(r.gen_str(10)) {
@@ -93,7 +93,7 @@ fn str_set() {
 fn vec_plus() {
     let r = rand::Rng();
 
-    let mut v = ~[]; 
+    let mut v = ~[];
     let mut i = 0;
     while i < 1500 {
         let rv = vec::from_elem(r.gen_uint_range(0, i + 1), i);
diff --git a/src/test/bench/graph500-bfs.rs b/src/test/bench/graph500-bfs.rs
index 35bd280928b..6c5a8a4377e 100644
--- a/src/test/bench/graph500-bfs.rs
+++ b/src/test/bench/graph500-bfs.rs
@@ -19,9 +19,9 @@ An implementation of the Graph500 Breadth First Search problem in Rust.
 extern mod std;
 use std::arc;
 use std::time;
-use std::map;
-use std::map::Map;
-use std::map::HashMap;
+use std::oldmap;
+use std::oldmap::Map;
+use std::oldmap::HashMap;
 use std::deque;
 use std::deque::Deque;
 use std::par;
@@ -41,7 +41,7 @@ fn make_edges(scale: uint, edgefactor: uint) -> ~[(node_id, node_id)] {
         let A = 0.57;
         let B = 0.19;
         let C = 0.19;
- 
+
         if scale == 0u {
             (i, j)
         }
@@ -49,7 +49,7 @@ fn make_edges(scale: uint, edgefactor: uint) -> ~[(node_id, node_id)] {
             let i = i * 2i64;
             let j = j * 2i64;
             let scale = scale - 1u;
-            
+
             let x = r.gen_float();
 
             if x < A {
@@ -80,38 +80,38 @@ fn make_edges(scale: uint, edgefactor: uint) -> ~[(node_id, node_id)] {
 
 fn make_graph(N: uint, edges: ~[(node_id, node_id)]) -> graph {
     let graph = do vec::from_fn(N) |_i| {
-        map::HashMap::<node_id, ()>()
+        oldmap::HashMap::<node_id, ()>()
     };
 
     do vec::each(edges) |e| {
         match *e {
             (i, j) => {
-                map::set_add(graph[i], j);
-                map::set_add(graph[j], i);
+                oldmap::set_add(graph[i], j);
+                oldmap::set_add(graph[j], i);
             }
         }
         true
     }
 
     do graph.map() |v| {
-        map::vec_from_set(*v)
+        oldmap::vec_from_set(*v)
     }
 }
 
 fn gen_search_keys(graph: graph, n: uint) -> ~[node_id] {
-    let keys = map::HashMap::<node_id, ()>();
+    let keys = oldmap::HashMap::<node_id, ()>();
     let r = rand::Rng();
 
-    while keys.size() < n {
+    while keys.len() < n {
         let k = r.gen_uint_range(0u, graph.len());
 
         if graph[k].len() > 0u && vec::any(graph[k], |i| {
             *i != k as node_id
         }) {
-            map::set_add(keys, k as node_id);
+            oldmap::set_add(keys, k as node_id);
         }
     }
-    map::vec_from_set(keys)
+    oldmap::vec_from_set(keys)
 }
 
 /**
@@ -120,7 +120,7 @@ fn gen_search_keys(graph: graph, n: uint) -> ~[node_id] {
  * Nodes that are unreachable have a parent of -1.
  */
 fn bfs(graph: graph, key: node_id) -> bfs_result {
-    let marks : ~[mut node_id] 
+    let marks : ~[mut node_id]
         = vec::cast_to_mut(vec::from_elem(vec::len(graph), -1i64));
 
     let Q = deque::create();
@@ -300,7 +300,7 @@ fn pbfs(&&graph: arc::ARC<graph>, key: node_id) -> bfs_result {
 }
 
 /// Performs at least some of the validation in the Graph500 spec.
-fn validate(edges: ~[(node_id, node_id)], 
+fn validate(edges: ~[(node_id, node_id)],
             root: node_id, tree: bfs_result) -> bool {
     // There are 5 things to test. Below is code for each of them.
 
@@ -336,7 +336,7 @@ fn validate(edges: ~[(node_id, node_id)],
             path.len() as int
         }
     };
-    
+
     if !status { return status }
 
     // 2. Each tree edge connects vertices whose BFS levels differ by
@@ -366,7 +366,7 @@ fn validate(edges: ~[(node_id, node_id)],
         abs(level[u] - level[v]) <= 1
     };
 
-    if !status { return status }    
+    if !status { return status }
 
     // 4. The BFS tree spans an entire connected component's vertices.
 
@@ -388,7 +388,7 @@ fn validate(edges: ~[(node_id, node_id)],
         }
     };
 
-    if !status { return status }    
+    if !status { return status }
 
     // If we get through here, all the tests passed!
     true
@@ -440,44 +440,44 @@ fn main() {
             let start = time::precise_time_s();
             let bfs_tree = bfs(copy graph, *root);
             let stop = time::precise_time_s();
-            
+
             //total_seq += stop - start;
 
             io::stdout().write_line(
                 fmt!("Sequential BFS completed in %? seconds.",
                      stop - start));
-            
+
             if do_validate {
                 let start = time::precise_time_s();
                 assert(validate(copy edges, *root, bfs_tree));
                 let stop = time::precise_time_s();
-                
+
                 io::stdout().write_line(
                     fmt!("Validation completed in %? seconds.",
                          stop - start));
             }
-            
+
             let start = time::precise_time_s();
             let bfs_tree = bfs2(copy graph, *root);
             let stop = time::precise_time_s();
-            
+
             total_seq += stop - start;
-            
+
             io::stdout().write_line(
                 fmt!("Alternate Sequential BFS completed in %? seconds.",
                      stop - start));
-            
+
             if do_validate {
                 let start = time::precise_time_s();
                 assert(validate(copy edges, *root, bfs_tree));
                 let stop = time::precise_time_s();
-                
+
                 io::stdout().write_line(
                     fmt!("Validation completed in %? seconds.",
                          stop - start));
             }
         }
-        
+
         let start = time::precise_time_s();
         let bfs_tree = pbfs(graph_arc, *root);
         let stop = time::precise_time_s();
@@ -491,7 +491,7 @@ fn main() {
             let start = time::precise_time_s();
             assert(validate(copy edges, *root, bfs_tree));
             let stop = time::precise_time_s();
-            
+
             io::stdout().write_line(fmt!("Validation completed in %? seconds.",
                                          stop - start));
         }
diff --git a/src/test/bench/shootout-chameneos-redux.rs b/src/test/bench/shootout-chameneos-redux.rs
index ad248a4aa29..6de8d13529a 100644
--- a/src/test/bench/shootout-chameneos-redux.rs
+++ b/src/test/bench/shootout-chameneos-redux.rs
@@ -11,8 +11,8 @@
 // chameneos
 
 extern mod std;
-use std::map;
-use std::map::HashMap;
+use std::oldmap;
+use std::oldmap::HashMap;
 use std::sort;
 use std::cell::Cell;
 use core::pipes::*;
diff --git a/src/test/bench/shootout-k-nucleotide-pipes.rs b/src/test/bench/shootout-k-nucleotide-pipes.rs
index fab0af479cc..0f4f22196ce 100644
--- a/src/test/bench/shootout-k-nucleotide-pipes.rs
+++ b/src/test/bench/shootout-k-nucleotide-pipes.rs
@@ -14,15 +14,15 @@
 #[legacy_modes];
 
 extern mod std;
-use std::map;
-use std::map::HashMap;
+use std::oldmap;
+use std::oldmap::HashMap;
 use std::sort;
 use io::ReaderUtil;
 use pipes::{stream, Port, Chan};
 use cmp::Ord;
 
 // given a map, print a sorted version of it
-fn sort_and_fmt(mm: HashMap<~[u8], uint>, total: uint) -> ~str { 
+fn sort_and_fmt(mm: HashMap<~[u8], uint>, total: uint) -> ~str {
    fn pct(xx: uint, yy: uint) -> float {
       return (xx as float) * 100f / (yy as float);
    }
@@ -49,10 +49,9 @@ fn sort_and_fmt(mm: HashMap<~[u8], uint>, total: uint) -> ~str {
    let mut pairs = ~[];
 
    // map -> [(k,%)]
-   mm.each(fn&(key: ~[u8], val: uint) -> bool {
+   for mm.each_ref |&key, &val| {
       pairs.push((key, pct(val, total)));
-      return true;
-   });
+   }
 
    let pairs_sorted = sortKV(pairs);
 
@@ -95,13 +94,13 @@ fn windows_with_carry(bb: &[u8], nn: uint,
       ii += 1u;
    }
 
-   return vec::slice(bb, len - (nn - 1u), len); 
+   return vec::slice(bb, len - (nn - 1u), len);
 }
 
 fn make_sequence_processor(sz: uint, from_parent: pipes::Port<~[u8]>,
                            to_parent: pipes::Chan<~str>) {
-   
-   let freqs: HashMap<~[u8], uint> = map::HashMap();
+
+   let freqs: HashMap<~[u8], uint> = oldmap::HashMap();
    let mut carry: ~[u8] = ~[];
    let mut total: uint = 0u;
 
@@ -118,7 +117,7 @@ fn make_sequence_processor(sz: uint, from_parent: pipes::Port<~[u8]>,
       });
    }
 
-   let buffer = match sz { 
+   let buffer = match sz {
        1u => { sort_and_fmt(freqs, total) }
        2u => { sort_and_fmt(freqs, total) }
        3u => { fmt!("%u\t%s", find(freqs, ~"GGT"), ~"GGT") }
@@ -165,11 +164,11 @@ fn main() {
         do task::spawn_with(move from_parent) |move to_parent_, from_parent| {
             make_sequence_processor(sz, from_parent, to_parent_);
         };
-        
+
         move to_child
     });
-         
-   
+
+
    // latch stores true after we've started
    // reading the sequence of interest
    let mut proc_mode = false;
diff --git a/src/test/bench/shootout-mandelbrot.rs b/src/test/bench/shootout-mandelbrot.rs
index 6133f9befcf..8cf57b19825 100644
--- a/src/test/bench/shootout-mandelbrot.rs
+++ b/src/test/bench/shootout-mandelbrot.rs
@@ -22,7 +22,7 @@
 
 extern mod std;
 use io::WriterUtil;
-use std::map::HashMap;
+use std::oldmap::HashMap;
 
 struct cmplx {
     re: f64,
@@ -134,11 +134,11 @@ fn writer(path: ~str, pport: pipes::Port<Line>, size: uint)
             done += 1_u;
             let mut prev = done;
             while prev <= i {
-                if lines.contains_key(prev) {
+                if lines.contains_key_ref(&prev) {
                     debug!("WS %u", prev);
                     cout.write(lines.get(prev));
                     done += 1_u;
-                    lines.remove(prev);
+                    lines.remove(&prev);
                     prev += 1_u;
                 }
                 else {
diff --git a/src/test/compile-fail/borrowck-borrowed-uniq-rvalue.rs b/src/test/compile-fail/borrowck-borrowed-uniq-rvalue.rs
index 19cdfe784d2..55cbb1cbdca 100644
--- a/src/test/compile-fail/borrowck-borrowed-uniq-rvalue.rs
+++ b/src/test/compile-fail/borrowck-borrowed-uniq-rvalue.rs
@@ -10,8 +10,8 @@
 
 //buggy.rs
 extern mod std;
-use std::map::HashMap;
-use std::map;
+use std::oldmap::HashMap;
+use std::oldmap;
 
 fn main() {
     let buggy_map :HashMap<uint, &uint> =
diff --git a/src/test/compile-fail/for-loop-decl.rs b/src/test/compile-fail/for-loop-decl.rs
index 9745f80a909..3f497094208 100644
--- a/src/test/compile-fail/for-loop-decl.rs
+++ b/src/test/compile-fail/for-loop-decl.rs
@@ -10,7 +10,7 @@
 
 // error-pattern: mismatched types
 extern mod std;
-use std::map::HashMap;
+use std::oldmap::HashMap;
 use std::bitv;
 
 type fn_info = {vars: HashMap<uint, var_info>};
diff --git a/src/test/compile-fail/map-types.rs b/src/test/compile-fail/map-types.rs
index 7161e854447..f829c730637 100644
--- a/src/test/compile-fail/map-types.rs
+++ b/src/test/compile-fail/map-types.rs
@@ -8,16 +8,14 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-extern mod std;
-use std::map;
-use std::map::HashMap;
-use std::map::StdMap;
+use core::container::Map;
+use core::hashmap::linear::LinearMap;
 
 // Test that trait types printed in error msgs include the type arguments.
 
 fn main() {
-    let x: StdMap<~str,~str> = map::HashMap::<~str,~str>() as
-        StdMap::<~str,~str>;
-    let y: StdMap<uint,~str> = x;
-    //~^ ERROR mismatched types: expected `@std::map::StdMap<uint,~str>`
+    let x: Map<~str, ~str> = LinearMap::new::<~str, ~str>() as
+        Map::<~str, ~str>;
+    let y: Map<uint, ~str> = x;
+    //~^ ERROR mismatched types: expected `@core::container::Map/&<uint,~str>`
 }
diff --git a/src/test/run-fail/unwind-misc-1.rs b/src/test/run-fail/unwind-misc-1.rs
index 116918f044c..a504e374b95 100644
--- a/src/test/run-fail/unwind-misc-1.rs
+++ b/src/test/run-fail/unwind-misc-1.rs
@@ -11,12 +11,12 @@
 // error-pattern:fail
 
 extern mod std;
-use std::map;
-use std::map::HashMap;
+use std::oldmap;
+use std::oldmap::HashMap;
 
 fn main() {
     let count = @mut 0u;
-    let map = map::HashMap();
+    let map = oldmap::HashMap();
     let mut arr = ~[];
     for uint::range(0u, 10u) |i| {
         arr += ~[@~"key stuff"];
diff --git a/src/test/run-pass/class-impl-parameterized-trait.rs b/src/test/run-pass/class-impl-parameterized-trait.rs
index 57ebb594af2..4b4eb1fc774 100644
--- a/src/test/run-pass/class-impl-parameterized-trait.rs
+++ b/src/test/run-pass/class-impl-parameterized-trait.rs
@@ -12,7 +12,7 @@
 // xfail-fast
 
 extern mod std;
-use std::map::*;
+use std::oldmap::*;
 
 class cat : map<int, bool> {
   priv {
diff --git a/src/test/run-pass/class-impl-very-parameterized-trait.rs b/src/test/run-pass/class-impl-very-parameterized-trait.rs
index 344f6230203..b7c8322316f 100644
--- a/src/test/run-pass/class-impl-very-parameterized-trait.rs
+++ b/src/test/run-pass/class-impl-very-parameterized-trait.rs
@@ -9,10 +9,8 @@
 // except according to those terms.
 
 // xfail-fast
-#[legacy_modes];
 
-extern mod std;
-use std::map::*;
+use core::container::{Container, Mutable, Map};
 
 enum cat_type { tuxedo, tabby, tortoiseshell }
 
@@ -28,121 +26,110 @@ impl cat_type : cmp::Eq {
 
 // ok: T should be in scope when resolving the trait ref for map
 struct cat<T> {
-  // Yes, you can have negative meows
-  priv mut meows : int,
+    // Yes, you can have negative meows
+    priv mut meows : int,
 
-  mut how_hungry : int,
-  name : T,
+    mut how_hungry : int,
+    name : T,
 }
 
-impl<T: Copy> cat<T> {
-  fn speak() { self.meow(); }
+impl<T> cat<T> {
+    fn speak(&mut self) { self.meow(); }
 
-  fn eat() -> bool {
-    if self.how_hungry > 0 {
-        error!("OM NOM NOM");
-        self.how_hungry -= 2;
-        return true;
-    }
-    else {
-        error!("Not hungry!");
-        return false;
-    }
-  }
-}
-
-impl<T: Copy> cat<T> : StdMap<int, T> {
-  pure fn size() -> uint { self.meows as uint }
-  fn insert(+k: int, +_v: T) -> bool {
-    self.meows += k;
-    true
-  }
-  pure fn contains_key(+k: int) -> bool { k <= self.meows }
-  pure fn contains_key_ref(k: &int) -> bool { self.contains_key(*k) }
-
-  pure fn get(+k:int) -> T { match self.find(k) {
-      Some(v) => { v }
-      None    => { die!(~"epic fail"); }
-    }
-  }
-  pure fn find(+k:int) -> Option<T> { if k <= self.meows {
-        Some(self.name)
-     }
-     else { None }
-  }
-
-  fn update_with_key(+key: int, +val: T, ff: fn(+k: int, +v0: T, +v1: T) -> T) -> bool {
-    match self.find(key) {
-      None            => return self.insert(key, val),
-      Some(copy orig) => return self.insert(key, ff(key, orig, val))
-    }
-  }
-
-  fn update(+key: int, +val: T, ff: fn(+v0: T, +v1: T) -> T) -> bool {
-    match self.find(key) {
-      None            => return self.insert(key, val),
-      Some(copy orig) => return self.insert(key, ff(orig, val))
-    }
-  }
-
-
-  fn remove(+k:int) -> bool {
-    match self.find(k) {
-      Some(x) => {
-        self.meows -= k; true
-      }
-      None => { false }
-    }
-  }
-
-  pure fn each(f: fn(+v: int, +v: T) -> bool) {
-    let mut n = int::abs(self.meows);
-    while n > 0 {
-        if !f(n, self.name) { break; }
-        n -= 1;
-    }
-  }
-
-  pure fn each_key(&&f: fn(+v: int) -> bool) {
-    for self.each |k, _v| { if !f(k) { break; } loop;};
-  }
-  pure fn each_value(&&f: fn(+v: T) -> bool) {
-    for self.each |_k, v| { if !f(v) { break; } loop;};
-  }
-
-  pure fn each_ref(f: fn(k: &int, v: &T) -> bool) {}
-  pure fn each_key_ref(f: fn(k: &int) -> bool) {}
-  pure fn each_value_ref(f: fn(k: &T) -> bool) {}
-
-  fn clear() { }
-}
-
-priv impl<T: Copy> cat<T> {
-    fn meow() {
-      self.meows += 1;
-      error!("Meow %d", self.meows);
-      if self.meows % 5 == 0 {
-          self.how_hungry += 1;
-      }
+    fn eat(&mut self) -> bool {
+        if self.how_hungry > 0 {
+            error!("OM NOM NOM");
+            self.how_hungry -= 2;
+            return true;
+        } else {
+            error!("Not hungry!");
+            return false;
+        }
     }
 }
 
-fn cat<T: Copy>(in_x : int, in_y : int, in_name: T) -> cat<T> {
-    cat {
-        meows: in_x,
-        how_hungry: in_y,
-        name: in_name
+impl<T> cat<T>: Container {
+    pure fn len(&self) -> uint { self.meows as uint }
+    pure fn is_empty(&self) -> bool { self.meows == 0 }
+}
+
+impl<T> cat<T>: Mutable {
+    fn clear(&mut self) {}
+}
+
+impl<T> cat<T>: Map<int, T> {
+    pure fn contains_key(&self, k: &int) -> bool { *k <= self.meows }
+
+    pure fn each(&self, f: fn(v: &int, v: &T) -> bool) {
+        let mut n = int::abs(self.meows);
+        while n > 0 {
+            if !f(&n, &self.name) { break; }
+            n -= 1;
+        }
+    }
+
+    pure fn each_key(&self, f: fn(v: &int) -> bool) {
+        for self.each |k, _| { if !f(k) { break; } loop;};
+    }
+
+    pure fn each_value(&self, f: fn(v: &T) -> bool) {
+        for self.each |_, v| { if !f(v) { break; } loop;};
+    }
+
+    fn insert(&mut self, k: int, _: T) -> bool {
+        self.meows += k;
+        true
+    }
+
+    pure fn find(&self, k: &int) -> Option<&self/T> {
+        if *k <= self.meows {
+            Some(&self.name)
+        } else {
+            None
+        }
+    }
+
+    fn remove(&mut self, k: &int) -> bool {
+        match self.find(k) {
+          Some(_) => {
+              self.meows -= *k; true
+          }
+          None => { false }
+        }
     }
 }
 
-pub fn main() {
-  let nyan : cat<~str> = cat(0, 2, ~"nyan");
-  for uint::range(1u, 5u) |_i| { nyan.speak(); }
-  assert(nyan.find(1) == Some(~"nyan"));
-  assert(nyan.find(10) == None);
-  let spotty : cat<cat_type> = cat(2, 57, tuxedo);
-  for uint::range(0u, 6u) |_i| { spotty.speak(); }
-  assert(spotty.size() == 8u);
-  assert(spotty.contains_key(2));
-  assert(spotty.get(3) == tuxedo);
+impl<T> cat<T> {
+    pure fn get(&self, k: &int) -> &self/T {
+        match self.find(k) {
+          Some(v) => { v }
+          None    => { die!(~"epic fail"); }
+        }
+    }
+
+    static pure fn new(in_x: int, in_y: int, in_name: T) -> cat<T> {
+        cat{meows: in_x, how_hungry: in_y, name: in_name }
+    }
+}
+
+priv impl<T> cat<T> {
+    fn meow(&mut self) {
+        self.meows += 1;
+        error!("Meow %d", self.meows);
+        if self.meows % 5 == 0 {
+            self.how_hungry += 1;
+        }
+    }
+}
+
+fn main() {
+    let mut nyan: cat<~str> = cat::new(0, 2, ~"nyan");
+    for uint::range(1, 5) |_| { nyan.speak(); }
+    assert(*nyan.find(&1).unwrap() == ~"nyan");
+    assert(nyan.find(&10) == None);
+    let mut spotty: cat<cat_type> = cat::new(2, 57, tuxedo);
+    for uint::range(0, 6) |_| { spotty.speak(); }
+    assert(spotty.len() == 8);
+    assert(spotty.contains_key(&2));
+    assert(spotty.get(&3) == &tuxedo);
 }
diff --git a/src/test/run-pass/class-implements-multiple-traits.rs b/src/test/run-pass/class-implements-multiple-traits.rs
index 9b2e349e66c..6d2fb984365 100644
--- a/src/test/run-pass/class-implements-multiple-traits.rs
+++ b/src/test/run-pass/class-implements-multiple-traits.rs
@@ -11,7 +11,7 @@
 // xfail-test
 
 extern mod std;
-use std::map::*;
+use std::oldmap::*;
 use vec::*;
 use dvec::{dvec, extensions};
 
diff --git a/src/test/run-pass/class-trait-bounded-param.rs b/src/test/run-pass/class-trait-bounded-param.rs
index 6e09ac22b3d..e3c4703432f 100644
--- a/src/test/run-pass/class-trait-bounded-param.rs
+++ b/src/test/run-pass/class-trait-bounded-param.rs
@@ -11,7 +11,7 @@
 // xfail-test
 
 extern mod std;
-use std::map::{map, hashmap, int_hash};
+use std::oldmap::{map, hashmap, int_hash};
 
 class keys<K: Copy, V: Copy, M: Copy map<K,V>>
     : iter::base_iter<K> {
diff --git a/src/test/run-pass/duplicate-use.rs b/src/test/run-pass/duplicate-use.rs
index 3bfd4a7dc46..f81b33105e6 100644
--- a/src/test/run-pass/duplicate-use.rs
+++ b/src/test/run-pass/duplicate-use.rs
@@ -11,7 +11,7 @@
 // xfail-test
 extern mod std;
 
-use list = std::map::chained;
+use list = std::oldmap::chained;
 use std::list;
 
 pub fn main() {
diff --git a/src/test/run-pass/extern-mod-syntax.rs b/src/test/run-pass/extern-mod-syntax.rs
index fdd2c62e01f..2a7843bdccd 100644
--- a/src/test/run-pass/extern-mod-syntax.rs
+++ b/src/test/run-pass/extern-mod-syntax.rs
@@ -11,7 +11,7 @@
 // except according to those terms.
 
 extern mod std;
-use std::map::HashMap;
+use std::oldmap::HashMap;
 
 pub fn main() {
     io::println("Hello world!");
diff --git a/src/test/run-pass/hashmap-memory.rs b/src/test/run-pass/hashmap-memory.rs
index 93056358de4..43e2bee644a 100644
--- a/src/test/run-pass/hashmap-memory.rs
+++ b/src/test/run-pass/hashmap-memory.rs
@@ -18,15 +18,15 @@
 
 extern mod std;
 
-use std::map;
-use std::map::HashMap;
+use std::oldmap;
+use std::oldmap::HashMap;
 use core::pipes::*;
 
 pub fn map(filename: ~str, emit: map_reduce::putter) { emit(filename, ~"1"); }
 
 mod map_reduce {
-    use std::map;
-    use std::map::HashMap;
+    use std::oldmap;
+    use std::oldmap::HashMap;
     use core::pipes::*;
 
     pub type putter = fn@(~str, ~str);
@@ -44,9 +44,9 @@ mod map_reduce {
     }
 
     fn map_task(ctrl: SharedChan<ctrl_proto>, input: ~str) {
-        let intermediates = map::HashMap();
+        let intermediates = oldmap::HashMap();
 
-        fn emit(im: map::HashMap<~str, int>, ctrl: SharedChan<ctrl_proto>, key: ~str,
+        fn emit(im: oldmap::HashMap<~str, int>, ctrl: SharedChan<ctrl_proto>, key: ~str,
                 val: ~str) {
             let mut c;
             match im.find(copy key) {
@@ -75,9 +75,9 @@ mod map_reduce {
         // This task becomes the master control task. It spawns others
         // to do the rest.
 
-        let mut reducers: map::HashMap<~str, int>;
+        let mut reducers: oldmap::HashMap<~str, int>;
 
-        reducers = map::HashMap();
+        reducers = oldmap::HashMap();
 
         start_mappers(ctrl_chan, copy inputs);
 
diff --git a/src/test/run-pass/issue-1696.rs b/src/test/run-pass/issue-1696.rs
index a10edcddbad..fb61e34f351 100644
--- a/src/test/run-pass/issue-1696.rs
+++ b/src/test/run-pass/issue-1696.rs
@@ -11,11 +11,10 @@
 // except according to those terms.
 
 extern mod std;
-use std::map;
-use std::map::HashMap;
+use std::oldmap::HashMap;
 
 pub fn main() {
-    let m = map::HashMap();
+    let m = HashMap();
     m.insert(str::to_bytes(~"foo"), str::to_bytes(~"bar"));
     log(error, m);
 }
diff --git a/src/test/run-pass/issue-2631-b.rs b/src/test/run-pass/issue-2631-b.rs
index 351a5a69aca..79c884f869f 100644
--- a/src/test/run-pass/issue-2631-b.rs
+++ b/src/test/run-pass/issue-2631-b.rs
@@ -15,8 +15,8 @@ extern mod req;
 extern mod std;
 
 use req::*;
-use std::map::*;
-use std::map::HashMap;
+use std::oldmap::*;
+use std::oldmap::HashMap;
 
 pub fn main() {
   let v = ~[@~"hi"];
diff --git a/src/test/run-pass/issue-2804-2.rs b/src/test/run-pass/issue-2804-2.rs
index 6d9cb3069e9..9fe88227c44 100644
--- a/src/test/run-pass/issue-2804-2.rs
+++ b/src/test/run-pass/issue-2804-2.rs
@@ -13,9 +13,9 @@
 // Minimized version of issue-2804.rs. Both check that callee IDs don't
 // clobber the previous node ID in a macro expr
 extern mod std;
-use std::map::HashMap;
+use std::oldmap::HashMap;
 
-fn add_interfaces(managed_ip: ~str, device: std::map::HashMap<~str, int>)  {
+fn add_interfaces(managed_ip: ~str, device: std::oldmap::HashMap<~str, int>)  {
      error!("%s, %?", managed_ip, device[~"interfaces"]);
 }
 
diff --git a/src/test/run-pass/issue-2804.rs b/src/test/run-pass/issue-2804.rs
index e242763e90b..613652ec852 100644
--- a/src/test/run-pass/issue-2804.rs
+++ b/src/test/run-pass/issue-2804.rs
@@ -12,7 +12,7 @@
 
 extern mod std;
 use io::WriterUtil;
-use std::map::HashMap;
+use std::oldmap::HashMap;
 use std::json;
 
 enum object
@@ -60,7 +60,7 @@ fn add_interface(store: int, managed_ip: ~str, data: std::json::Json) -> (~str,
     }
 }
 
-fn add_interfaces(store: int, managed_ip: ~str, device: std::map::HashMap<~str, std::json::Json>) -> ~[(~str, object)]
+fn add_interfaces(store: int, managed_ip: ~str, device: std::oldmap::HashMap<~str, std::json::Json>) -> ~[(~str, object)]
 {
     match device[~"interfaces"]
     {
diff --git a/src/test/run-pass/issue-3026.rs b/src/test/run-pass/issue-3026.rs
index 8731df5a33b..32f7d2ee07c 100644
--- a/src/test/run-pass/issue-3026.rs
+++ b/src/test/run-pass/issue-3026.rs
@@ -11,8 +11,8 @@
 // except according to those terms.
 
 extern mod std;
-use std::map::HashMap;
-use std::map;
+use std::oldmap::HashMap;
+use std::oldmap;
 
 pub fn main() {
     let buggy_map :HashMap<uint, &uint> = HashMap::<uint, &uint>();
diff --git a/src/test/run-pass/issue-3559.rs b/src/test/run-pass/issue-3559.rs
index d5f165263c9..aff0b4fc71e 100644
--- a/src/test/run-pass/issue-3559.rs
+++ b/src/test/run-pass/issue-3559.rs
@@ -14,7 +14,7 @@
 extern mod std;
 
 use core::io::{WriterUtil};
-use std::map::*;
+use std::oldmap::*;
 
 #[cfg(test)]
 fn check_strs(actual: &str, expected: &str) -> bool
diff --git a/src/test/run-pass/issue-4092.rs b/src/test/run-pass/issue-4092.rs
index 326dade15d9..5cfb5809feb 100644
--- a/src/test/run-pass/issue-4092.rs
+++ b/src/test/run-pass/issue-4092.rs
@@ -11,6 +11,6 @@
 extern mod std;
 
 pub fn main() {
-    let x = std::map::HashMap();
+    let x = std::oldmap::HashMap();
     x.insert((@"abc", 0), 0);
 }