diff --git a/src/librustc_builtin_macros/Cargo.toml b/src/librustc_builtin_macros/Cargo.toml
index 9fcc1595e4a..d2834bf7022 100644
--- a/src/librustc_builtin_macros/Cargo.toml
+++ b/src/librustc_builtin_macros/Cargo.toml
@@ -19,6 +19,6 @@ rustc_parse = { path = "../librustc_parse" }
 rustc_target = { path = "../librustc_target" }
 smallvec = { version = "1.0", features = ["union", "may_dangle"] }
 syntax = { path = "../libsyntax" }
-syntax_expand = { path = "../librustc_expand", package = "rustc_expand" }
+rustc_expand = { path = "../librustc_expand" }
 syntax_pos = { path = "../librustc_span", package = "rustc_span" }
 rustc_error_codes = { path = "../librustc_error_codes" }
diff --git a/src/librustc_builtin_macros/asm.rs b/src/librustc_builtin_macros/asm.rs
index 324bef9cbb8..0e1ff7603ba 100644
--- a/src/librustc_builtin_macros/asm.rs
+++ b/src/librustc_builtin_macros/asm.rs
@@ -3,6 +3,7 @@
 use State::*;
 
 use errors::{DiagnosticBuilder, PResult};
+use rustc_expand::base::*;
 use rustc_parse::parser::Parser;
 use syntax::ast::{self, AsmDialect};
 use syntax::ptr::P;
@@ -10,7 +11,6 @@ use syntax::symbol::{kw, sym, Symbol};
 use syntax::token::{self, Token};
 use syntax::tokenstream::{self, TokenStream};
 use syntax::{span_err, struct_span_err};
-use syntax_expand::base::*;
 use syntax_pos::Span;
 
 use rustc_error_codes::*;
diff --git a/src/librustc_builtin_macros/assert.rs b/src/librustc_builtin_macros/assert.rs
index 331e9fa61d0..59e499b8f8e 100644
--- a/src/librustc_builtin_macros/assert.rs
+++ b/src/librustc_builtin_macros/assert.rs
@@ -1,5 +1,6 @@
 use errors::{Applicability, DiagnosticBuilder};
 
+use rustc_expand::base::*;
 use rustc_parse::parser::Parser;
 use syntax::ast::{self, *};
 use syntax::print::pprust;
@@ -7,7 +8,6 @@ use syntax::ptr::P;
 use syntax::symbol::{sym, Symbol};
 use syntax::token::{self, TokenKind};
 use syntax::tokenstream::{DelimSpan, TokenStream, TokenTree};
-use syntax_expand::base::*;
 use syntax_pos::{Span, DUMMY_SP};
 
 pub fn expand_assert<'cx>(
diff --git a/src/librustc_builtin_macros/cfg.rs b/src/librustc_builtin_macros/cfg.rs
index 7b1dbcc7762..6d97b94ab9f 100644
--- a/src/librustc_builtin_macros/cfg.rs
+++ b/src/librustc_builtin_macros/cfg.rs
@@ -3,11 +3,11 @@
 /// current compilation environment.
 use errors::DiagnosticBuilder;
 
+use rustc_expand::base::{self, *};
 use syntax::ast;
 use syntax::attr;
 use syntax::token;
 use syntax::tokenstream::TokenStream;
-use syntax_expand::base::{self, *};
 use syntax_pos::Span;
 
 pub fn expand_cfg(
diff --git a/src/librustc_builtin_macros/cmdline_attrs.rs b/src/librustc_builtin_macros/cmdline_attrs.rs
index 1ce083112a8..ea33d4c2c46 100644
--- a/src/librustc_builtin_macros/cmdline_attrs.rs
+++ b/src/librustc_builtin_macros/cmdline_attrs.rs
@@ -1,10 +1,10 @@
 //! Attributes injected into the crate root from command line using `-Z crate-attr`.
 
+use rustc_expand::panictry;
 use syntax::ast::{self, AttrItem, AttrStyle};
 use syntax::attr::mk_attr;
 use syntax::sess::ParseSess;
 use syntax::token;
-use syntax_expand::panictry;
 use syntax_pos::FileName;
 
 pub fn inject(mut krate: ast::Crate, parse_sess: &ParseSess, attrs: &[String]) -> ast::Crate {
diff --git a/src/librustc_builtin_macros/compile_error.rs b/src/librustc_builtin_macros/compile_error.rs
index 394259fc67b..95bcb6b075b 100644
--- a/src/librustc_builtin_macros/compile_error.rs
+++ b/src/librustc_builtin_macros/compile_error.rs
@@ -1,7 +1,7 @@
 // The compiler code necessary to support the compile_error! extension.
 
+use rustc_expand::base::{self, *};
 use syntax::tokenstream::TokenStream;
-use syntax_expand::base::{self, *};
 use syntax_pos::Span;
 
 pub fn expand_compile_error<'cx>(
diff --git a/src/librustc_builtin_macros/concat.rs b/src/librustc_builtin_macros/concat.rs
index 0cc8e205ae9..4dab74610c3 100644
--- a/src/librustc_builtin_macros/concat.rs
+++ b/src/librustc_builtin_macros/concat.rs
@@ -1,7 +1,7 @@
+use rustc_expand::base::{self, DummyResult};
 use syntax::ast;
 use syntax::symbol::Symbol;
 use syntax::tokenstream::TokenStream;
-use syntax_expand::base::{self, DummyResult};
 
 use std::string::String;
 
diff --git a/src/librustc_builtin_macros/concat_idents.rs b/src/librustc_builtin_macros/concat_idents.rs
index d870e858bea..4b5ade98237 100644
--- a/src/librustc_builtin_macros/concat_idents.rs
+++ b/src/librustc_builtin_macros/concat_idents.rs
@@ -1,8 +1,8 @@
+use rustc_expand::base::{self, *};
 use syntax::ast;
 use syntax::ptr::P;
 use syntax::token::{self, Token};
 use syntax::tokenstream::{TokenStream, TokenTree};
-use syntax_expand::base::{self, *};
 use syntax_pos::symbol::Symbol;
 use syntax_pos::Span;
 
diff --git a/src/librustc_builtin_macros/deriving/bounds.rs b/src/librustc_builtin_macros/deriving/bounds.rs
index 9793ac1ca08..7027ca979c6 100644
--- a/src/librustc_builtin_macros/deriving/bounds.rs
+++ b/src/librustc_builtin_macros/deriving/bounds.rs
@@ -2,8 +2,8 @@ use crate::deriving::generic::ty::*;
 use crate::deriving::generic::*;
 use crate::deriving::path_std;
 
+use rustc_expand::base::{Annotatable, ExtCtxt};
 use syntax::ast::MetaItem;
-use syntax_expand::base::{Annotatable, ExtCtxt};
 use syntax_pos::Span;
 
 pub fn expand_deriving_copy(
diff --git a/src/librustc_builtin_macros/deriving/clone.rs b/src/librustc_builtin_macros/deriving/clone.rs
index 171e4104c0a..a5971bb9176 100644
--- a/src/librustc_builtin_macros/deriving/clone.rs
+++ b/src/librustc_builtin_macros/deriving/clone.rs
@@ -2,10 +2,10 @@ use crate::deriving::generic::ty::*;
 use crate::deriving::generic::*;
 use crate::deriving::path_std;
 
+use rustc_expand::base::{Annotatable, ExtCtxt};
 use syntax::ast::{self, Expr, GenericArg, Generics, ItemKind, MetaItem, VariantData};
 use syntax::ptr::P;
 use syntax::symbol::{kw, sym, Symbol};
-use syntax_expand::base::{Annotatable, ExtCtxt};
 use syntax_pos::Span;
 
 pub fn expand_deriving_clone(
diff --git a/src/librustc_builtin_macros/deriving/cmp/eq.rs b/src/librustc_builtin_macros/deriving/cmp/eq.rs
index f292ec0e428..c71ade7304c 100644
--- a/src/librustc_builtin_macros/deriving/cmp/eq.rs
+++ b/src/librustc_builtin_macros/deriving/cmp/eq.rs
@@ -2,10 +2,10 @@ use crate::deriving::generic::ty::*;
 use crate::deriving::generic::*;
 use crate::deriving::path_std;
 
+use rustc_expand::base::{Annotatable, ExtCtxt};
 use syntax::ast::{self, Expr, GenericArg, Ident, MetaItem};
 use syntax::ptr::P;
 use syntax::symbol::{sym, Symbol};
-use syntax_expand::base::{Annotatable, ExtCtxt};
 use syntax_pos::Span;
 
 pub fn expand_deriving_eq(
diff --git a/src/librustc_builtin_macros/deriving/cmp/ord.rs b/src/librustc_builtin_macros/deriving/cmp/ord.rs
index e009763da1b..fc1349e3354 100644
--- a/src/librustc_builtin_macros/deriving/cmp/ord.rs
+++ b/src/librustc_builtin_macros/deriving/cmp/ord.rs
@@ -2,10 +2,10 @@ use crate::deriving::generic::ty::*;
 use crate::deriving::generic::*;
 use crate::deriving::path_std;
 
+use rustc_expand::base::{Annotatable, ExtCtxt};
 use syntax::ast::{self, Expr, MetaItem};
 use syntax::ptr::P;
 use syntax::symbol::sym;
-use syntax_expand::base::{Annotatable, ExtCtxt};
 use syntax_pos::Span;
 
 pub fn expand_deriving_ord(
diff --git a/src/librustc_builtin_macros/deriving/cmp/partial_eq.rs b/src/librustc_builtin_macros/deriving/cmp/partial_eq.rs
index 91c13b76a00..6475c22c009 100644
--- a/src/librustc_builtin_macros/deriving/cmp/partial_eq.rs
+++ b/src/librustc_builtin_macros/deriving/cmp/partial_eq.rs
@@ -2,10 +2,10 @@ use crate::deriving::generic::ty::*;
 use crate::deriving::generic::*;
 use crate::deriving::{path_local, path_std};
 
+use rustc_expand::base::{Annotatable, ExtCtxt};
 use syntax::ast::{BinOpKind, Expr, MetaItem};
 use syntax::ptr::P;
 use syntax::symbol::sym;
-use syntax_expand::base::{Annotatable, ExtCtxt};
 use syntax_pos::Span;
 
 pub fn expand_deriving_partial_eq(
diff --git a/src/librustc_builtin_macros/deriving/cmp/partial_ord.rs b/src/librustc_builtin_macros/deriving/cmp/partial_ord.rs
index 760ed325f36..3397f788605 100644
--- a/src/librustc_builtin_macros/deriving/cmp/partial_ord.rs
+++ b/src/librustc_builtin_macros/deriving/cmp/partial_ord.rs
@@ -4,10 +4,10 @@ use crate::deriving::generic::ty::*;
 use crate::deriving::generic::*;
 use crate::deriving::{path_local, path_std, pathvec_std};
 
+use rustc_expand::base::{Annotatable, ExtCtxt};
 use syntax::ast::{self, BinOpKind, Expr, MetaItem};
 use syntax::ptr::P;
 use syntax::symbol::{sym, Symbol};
-use syntax_expand::base::{Annotatable, ExtCtxt};
 use syntax_pos::Span;
 
 pub fn expand_deriving_partial_ord(
diff --git a/src/librustc_builtin_macros/deriving/debug.rs b/src/librustc_builtin_macros/deriving/debug.rs
index c145b63274e..4a3790e85dd 100644
--- a/src/librustc_builtin_macros/deriving/debug.rs
+++ b/src/librustc_builtin_macros/deriving/debug.rs
@@ -2,11 +2,11 @@ use crate::deriving::generic::ty::*;
 use crate::deriving::generic::*;
 use crate::deriving::path_std;
 
+use rustc_expand::base::{Annotatable, ExtCtxt};
 use syntax::ast::{self, Ident};
 use syntax::ast::{Expr, MetaItem};
 use syntax::ptr::P;
 use syntax::symbol::sym;
-use syntax_expand::base::{Annotatable, ExtCtxt};
 use syntax_pos::{Span, DUMMY_SP};
 
 pub fn expand_deriving_debug(
diff --git a/src/librustc_builtin_macros/deriving/decodable.rs b/src/librustc_builtin_macros/deriving/decodable.rs
index 7f21440d49a..290b8977b88 100644
--- a/src/librustc_builtin_macros/deriving/decodable.rs
+++ b/src/librustc_builtin_macros/deriving/decodable.rs
@@ -4,11 +4,11 @@ use crate::deriving::generic::ty::*;
 use crate::deriving::generic::*;
 use crate::deriving::pathvec_std;
 
+use rustc_expand::base::{Annotatable, ExtCtxt};
 use syntax::ast;
 use syntax::ast::{Expr, MetaItem, Mutability};
 use syntax::ptr::P;
 use syntax::symbol::Symbol;
-use syntax_expand::base::{Annotatable, ExtCtxt};
 use syntax_pos::Span;
 
 pub fn expand_deriving_rustc_decodable(
diff --git a/src/librustc_builtin_macros/deriving/default.rs b/src/librustc_builtin_macros/deriving/default.rs
index d623e1fa4cc..284c407f35f 100644
--- a/src/librustc_builtin_macros/deriving/default.rs
+++ b/src/librustc_builtin_macros/deriving/default.rs
@@ -2,11 +2,11 @@ use crate::deriving::generic::ty::*;
 use crate::deriving::generic::*;
 use crate::deriving::path_std;
 
+use rustc_expand::base::{Annotatable, DummyResult, ExtCtxt};
 use syntax::ast::{Expr, MetaItem};
 use syntax::ptr::P;
 use syntax::span_err;
 use syntax::symbol::{kw, sym};
-use syntax_expand::base::{Annotatable, DummyResult, ExtCtxt};
 use syntax_pos::Span;
 
 use rustc_error_codes::*;
diff --git a/src/librustc_builtin_macros/deriving/encodable.rs b/src/librustc_builtin_macros/deriving/encodable.rs
index 98b0160d6e8..31f9e38ba3d 100644
--- a/src/librustc_builtin_macros/deriving/encodable.rs
+++ b/src/librustc_builtin_macros/deriving/encodable.rs
@@ -89,10 +89,10 @@ use crate::deriving::generic::ty::*;
 use crate::deriving::generic::*;
 use crate::deriving::pathvec_std;
 
+use rustc_expand::base::{Annotatable, ExtCtxt};
 use syntax::ast::{Expr, ExprKind, MetaItem, Mutability};
 use syntax::ptr::P;
 use syntax::symbol::Symbol;
-use syntax_expand::base::{Annotatable, ExtCtxt};
 use syntax_pos::Span;
 
 pub fn expand_deriving_rustc_encodable(
diff --git a/src/librustc_builtin_macros/deriving/generic/mod.rs b/src/librustc_builtin_macros/deriving/generic/mod.rs
index c64b0bd9087..8af58e9e4ce 100644
--- a/src/librustc_builtin_macros/deriving/generic/mod.rs
+++ b/src/librustc_builtin_macros/deriving/generic/mod.rs
@@ -181,6 +181,7 @@ use std::cell::RefCell;
 use std::iter;
 use std::vec;
 
+use rustc_expand::base::{Annotatable, ExtCtxt};
 use syntax::ast::{self, BinOpKind, EnumDef, Expr, Generics, Ident, PatKind};
 use syntax::ast::{GenericArg, GenericParamKind, VariantData};
 use syntax::attr;
@@ -189,7 +190,6 @@ use syntax::sess::ParseSess;
 use syntax::source_map::respan;
 use syntax::symbol::{kw, sym, Symbol};
 use syntax::util::map_in_place::MapInPlace;
-use syntax_expand::base::{Annotatable, ExtCtxt};
 use syntax_pos::Span;
 
 use ty::{LifetimeBounds, Path, Ptr, PtrTy, Self_, Ty};
diff --git a/src/librustc_builtin_macros/deriving/generic/ty.rs b/src/librustc_builtin_macros/deriving/generic/ty.rs
index 7eab15aff77..993426501f5 100644
--- a/src/librustc_builtin_macros/deriving/generic/ty.rs
+++ b/src/librustc_builtin_macros/deriving/generic/ty.rs
@@ -4,10 +4,10 @@
 pub use PtrTy::*;
 pub use Ty::*;
 
+use rustc_expand::base::ExtCtxt;
 use syntax::ast::{self, Expr, GenericArg, GenericParamKind, Generics, Ident, SelfKind};
 use syntax::ptr::P;
 use syntax::source_map::{respan, DUMMY_SP};
-use syntax_expand::base::ExtCtxt;
 use syntax_pos::symbol::kw;
 use syntax_pos::Span;
 
diff --git a/src/librustc_builtin_macros/deriving/hash.rs b/src/librustc_builtin_macros/deriving/hash.rs
index acf18ac70e6..e75fe1a308c 100644
--- a/src/librustc_builtin_macros/deriving/hash.rs
+++ b/src/librustc_builtin_macros/deriving/hash.rs
@@ -2,10 +2,10 @@ use crate::deriving::generic::ty::*;
 use crate::deriving::generic::*;
 use crate::deriving::{self, path_std, pathvec_std};
 
+use rustc_expand::base::{Annotatable, ExtCtxt};
 use syntax::ast::{Expr, MetaItem, Mutability};
 use syntax::ptr::P;
 use syntax::symbol::sym;
-use syntax_expand::base::{Annotatable, ExtCtxt};
 use syntax_pos::Span;
 
 pub fn expand_deriving_hash(
diff --git a/src/librustc_builtin_macros/deriving/mod.rs b/src/librustc_builtin_macros/deriving/mod.rs
index 7ab4f008016..0856c0c2a9f 100644
--- a/src/librustc_builtin_macros/deriving/mod.rs
+++ b/src/librustc_builtin_macros/deriving/mod.rs
@@ -1,9 +1,9 @@
 //! The compiler code necessary to implement the `#[derive]` extensions.
 
+use rustc_expand::base::{Annotatable, ExtCtxt, MultiItemModifier};
 use syntax::ast::{self, ItemKind, MetaItem};
 use syntax::ptr::P;
 use syntax::symbol::{sym, Symbol};
-use syntax_expand::base::{Annotatable, ExtCtxt, MultiItemModifier};
 use syntax_pos::Span;
 
 macro path_local($x:ident) {
diff --git a/src/librustc_builtin_macros/env.rs b/src/librustc_builtin_macros/env.rs
index c9ecbabc8ff..dd78cecc85f 100644
--- a/src/librustc_builtin_macros/env.rs
+++ b/src/librustc_builtin_macros/env.rs
@@ -3,10 +3,10 @@
 // interface.
 //
 
+use rustc_expand::base::{self, *};
 use syntax::ast::{self, GenericArg, Ident};
 use syntax::symbol::{kw, sym, Symbol};
 use syntax::tokenstream::TokenStream;
-use syntax_expand::base::{self, *};
 use syntax_pos::Span;
 
 use std::env;
diff --git a/src/librustc_builtin_macros/format.rs b/src/librustc_builtin_macros/format.rs
index 1d1f68a4906..7b915a66dac 100644
--- a/src/librustc_builtin_macros/format.rs
+++ b/src/librustc_builtin_macros/format.rs
@@ -7,12 +7,12 @@ use errors::pluralize;
 use errors::Applicability;
 use errors::DiagnosticBuilder;
 
+use rustc_expand::base::{self, *};
 use syntax::ast;
 use syntax::ptr::P;
 use syntax::symbol::{sym, Symbol};
 use syntax::token;
 use syntax::tokenstream::TokenStream;
-use syntax_expand::base::{self, *};
 use syntax_pos::{MultiSpan, Span};
 
 use rustc_data_structures::fx::{FxHashMap, FxHashSet};
diff --git a/src/librustc_builtin_macros/global_allocator.rs b/src/librustc_builtin_macros/global_allocator.rs
index edfdda4703c..37fcd3cadba 100644
--- a/src/librustc_builtin_macros/global_allocator.rs
+++ b/src/librustc_builtin_macros/global_allocator.rs
@@ -1,11 +1,11 @@
 use crate::util::check_builtin_macro_attribute;
 
+use rustc_expand::base::{Annotatable, ExtCtxt};
 use syntax::ast::{self, Attribute, Expr, FnHeader, FnSig, Generics, Ident, Param};
 use syntax::ast::{ItemKind, Mutability, Stmt, Ty, TyKind, Unsafety};
 use syntax::expand::allocator::{AllocatorKind, AllocatorMethod, AllocatorTy, ALLOCATOR_METHODS};
 use syntax::ptr::P;
 use syntax::symbol::{kw, sym, Symbol};
-use syntax_expand::base::{Annotatable, ExtCtxt};
 use syntax_pos::Span;
 
 pub fn expand(
diff --git a/src/librustc_builtin_macros/global_asm.rs b/src/librustc_builtin_macros/global_asm.rs
index fc933e4673a..97ae8012ae3 100644
--- a/src/librustc_builtin_macros/global_asm.rs
+++ b/src/librustc_builtin_macros/global_asm.rs
@@ -9,13 +9,13 @@
 /// therefore apply.
 use errors::DiagnosticBuilder;
 
+use rustc_expand::base::{self, *};
 use smallvec::smallvec;
 use syntax::ast;
 use syntax::ptr::P;
 use syntax::source_map::respan;
 use syntax::token;
 use syntax::tokenstream::TokenStream;
-use syntax_expand::base::{self, *};
 use syntax_pos::Span;
 
 pub fn expand_global_asm<'cx>(
diff --git a/src/librustc_builtin_macros/lib.rs b/src/librustc_builtin_macros/lib.rs
index 40aafece8c6..e9709d981fe 100644
--- a/src/librustc_builtin_macros/lib.rs
+++ b/src/librustc_builtin_macros/lib.rs
@@ -13,11 +13,11 @@ extern crate proc_macro;
 
 use crate::deriving::*;
 
+use rustc_expand::base::{MacroExpanderFn, Resolver, SyntaxExtension, SyntaxExtensionKind};
+use rustc_expand::proc_macro::BangProcMacro;
 use syntax::ast::Ident;
 use syntax::edition::Edition;
 use syntax::symbol::sym;
-use syntax_expand::base::{MacroExpanderFn, Resolver, SyntaxExtension, SyntaxExtensionKind};
-use syntax_expand::proc_macro::BangProcMacro;
 
 mod asm;
 mod assert;
diff --git a/src/librustc_builtin_macros/log_syntax.rs b/src/librustc_builtin_macros/log_syntax.rs
index 111226be877..f873b1790da 100644
--- a/src/librustc_builtin_macros/log_syntax.rs
+++ b/src/librustc_builtin_macros/log_syntax.rs
@@ -1,6 +1,6 @@
+use rustc_expand::base;
 use syntax::print;
 use syntax::tokenstream::TokenStream;
-use syntax_expand::base;
 use syntax_pos;
 
 pub fn expand_log_syntax<'cx>(
diff --git a/src/librustc_builtin_macros/proc_macro_harness.rs b/src/librustc_builtin_macros/proc_macro_harness.rs
index b6436cc1646..bdd7b1d8993 100644
--- a/src/librustc_builtin_macros/proc_macro_harness.rs
+++ b/src/librustc_builtin_macros/proc_macro_harness.rs
@@ -1,5 +1,7 @@
 use std::mem;
 
+use rustc_expand::base::{ExtCtxt, Resolver};
+use rustc_expand::expand::{AstFragment, ExpansionConfig};
 use smallvec::smallvec;
 use syntax::ast::{self, Ident};
 use syntax::attr;
@@ -9,8 +11,6 @@ use syntax::ptr::P;
 use syntax::sess::ParseSess;
 use syntax::symbol::{kw, sym};
 use syntax::visit::{self, Visitor};
-use syntax_expand::base::{ExtCtxt, Resolver};
-use syntax_expand::expand::{AstFragment, ExpansionConfig};
 use syntax_pos::hygiene::AstPass;
 use syntax_pos::{Span, DUMMY_SP};
 
diff --git a/src/librustc_builtin_macros/source_util.rs b/src/librustc_builtin_macros/source_util.rs
index fccc36e2ea8..9e756c4c0e4 100644
--- a/src/librustc_builtin_macros/source_util.rs
+++ b/src/librustc_builtin_macros/source_util.rs
@@ -1,3 +1,5 @@
+use rustc_expand::base::{self, *};
+use rustc_expand::panictry;
 use rustc_parse::{self, new_sub_parser_from_file, parser::Parser, DirectoryOwnership};
 use syntax::ast;
 use syntax::early_buffered_lints::INCOMPLETE_INCLUDE;
@@ -6,8 +8,6 @@ use syntax::ptr::P;
 use syntax::symbol::Symbol;
 use syntax::token;
 use syntax::tokenstream::TokenStream;
-use syntax_expand::base::{self, *};
-use syntax_expand::panictry;
 
 use smallvec::SmallVec;
 use syntax_pos::{self, Pos, Span};
diff --git a/src/librustc_builtin_macros/standard_library_imports.rs b/src/librustc_builtin_macros/standard_library_imports.rs
index 50f86a0f3ec..41da95e0ecc 100644
--- a/src/librustc_builtin_macros/standard_library_imports.rs
+++ b/src/librustc_builtin_macros/standard_library_imports.rs
@@ -1,10 +1,10 @@
+use rustc_expand::base::{ExtCtxt, Resolver};
+use rustc_expand::expand::ExpansionConfig;
 use syntax::edition::Edition;
 use syntax::ptr::P;
 use syntax::sess::ParseSess;
 use syntax::symbol::{kw, sym, Ident, Symbol};
 use syntax::{ast, attr};
-use syntax_expand::base::{ExtCtxt, Resolver};
-use syntax_expand::expand::ExpansionConfig;
 use syntax_pos::hygiene::AstPass;
 use syntax_pos::DUMMY_SP;
 
diff --git a/src/librustc_builtin_macros/test.rs b/src/librustc_builtin_macros/test.rs
index edf427edaae..dccaf019998 100644
--- a/src/librustc_builtin_macros/test.rs
+++ b/src/librustc_builtin_macros/test.rs
@@ -2,12 +2,12 @@
 /// Ideally, this code would be in libtest but for efficiency and error messages it lives here.
 use crate::util::check_builtin_macro_attribute;
 
+use rustc_expand::base::*;
 use syntax::ast;
 use syntax::attr;
 use syntax::print::pprust;
 use syntax::source_map::respan;
 use syntax::symbol::{sym, Symbol};
-use syntax_expand::base::*;
 use syntax_pos::Span;
 
 use std::iter;
diff --git a/src/librustc_builtin_macros/test_harness.rs b/src/librustc_builtin_macros/test_harness.rs
index b00fc3d26c1..e596f3e4432 100644
--- a/src/librustc_builtin_macros/test_harness.rs
+++ b/src/librustc_builtin_macros/test_harness.rs
@@ -1,6 +1,8 @@
 // Code that generates a test runner to run all the tests in a crate
 
 use log::debug;
+use rustc_expand::base::{ExtCtxt, Resolver};
+use rustc_expand::expand::{AstFragment, ExpansionConfig};
 use rustc_feature::Features;
 use rustc_target::spec::PanicStrategy;
 use smallvec::{smallvec, SmallVec};
@@ -12,8 +14,6 @@ use syntax::ptr::P;
 use syntax::sess::ParseSess;
 use syntax::source_map::respan;
 use syntax::symbol::{sym, Symbol};
-use syntax_expand::base::{ExtCtxt, Resolver};
-use syntax_expand::expand::{AstFragment, ExpansionConfig};
 use syntax_pos::hygiene::{AstPass, SyntaxContext, Transparency};
 use syntax_pos::{Span, DUMMY_SP};
 
diff --git a/src/librustc_builtin_macros/trace_macros.rs b/src/librustc_builtin_macros/trace_macros.rs
index 96ae5bf5b4e..450a7269fd4 100644
--- a/src/librustc_builtin_macros/trace_macros.rs
+++ b/src/librustc_builtin_macros/trace_macros.rs
@@ -1,6 +1,6 @@
+use rustc_expand::base::{self, ExtCtxt};
 use syntax::symbol::kw;
 use syntax::tokenstream::{TokenStream, TokenTree};
-use syntax_expand::base::{self, ExtCtxt};
 use syntax_pos::Span;
 
 pub fn expand_trace_macros(
diff --git a/src/librustc_builtin_macros/util.rs b/src/librustc_builtin_macros/util.rs
index aedd5aac1a9..bd748c0c8c1 100644
--- a/src/librustc_builtin_macros/util.rs
+++ b/src/librustc_builtin_macros/util.rs
@@ -1,7 +1,7 @@
+use rustc_expand::base::ExtCtxt;
 use rustc_feature::AttributeTemplate;
 use rustc_parse::validate_attr;
 use syntax::ast::MetaItem;
-use syntax_expand::base::ExtCtxt;
 use syntax_pos::Symbol;
 
 pub fn check_builtin_macro_attribute(ecx: &ExtCtxt<'_>, meta_item: &MetaItem, name: Symbol) {
diff --git a/src/librustc_codegen_llvm/Cargo.toml b/src/librustc_codegen_llvm/Cargo.toml
index b48c6016644..e0b303710bf 100644
--- a/src/librustc_codegen_llvm/Cargo.toml
+++ b/src/librustc_codegen_llvm/Cargo.toml
@@ -30,5 +30,5 @@ rustc_session = { path = "../librustc_session" }
 rustc_target = { path = "../librustc_target" }
 smallvec = { version = "0.6.7", features = ["union", "may_dangle"] }
 syntax = { path = "../libsyntax" }
-syntax_expand = { path = "../librustc_expand", package = "rustc_expand" }
+rustc_expand = { path = "../librustc_expand" }
 syntax_pos = { path = "../librustc_span", package = "rustc_span" }
diff --git a/src/librustc_interface/Cargo.toml b/src/librustc_interface/Cargo.toml
index 25d140dc6dc..73ff0cd52d7 100644
--- a/src/librustc_interface/Cargo.toml
+++ b/src/librustc_interface/Cargo.toml
@@ -14,8 +14,8 @@ log = "0.4"
 rayon = { version = "0.3.0", package = "rustc-rayon" }
 smallvec = { version = "1.0", features = ["union", "may_dangle"] }
 syntax = { path = "../libsyntax" }
-syntax_ext = { path = "../librustc_builtin_macros", package = "rustc_builtin_macros" }
-syntax_expand = { path = "../librustc_expand", package = "rustc_expand" }
+rustc_builtin_macros = { path = "../librustc_builtin_macros" }
+rustc_expand = { path = "../librustc_expand" }
 rustc_parse = { path = "../librustc_parse" }
 syntax_pos = { path = "../librustc_span", package = "rustc_span" }
 rustc_serialize = { path = "../libserialize", package = "serialize" }
diff --git a/src/librustc_interface/passes.rs b/src/librustc_interface/passes.rs
index b4522f4c665..57fd2fb6d27 100644
--- a/src/librustc_interface/passes.rs
+++ b/src/librustc_interface/passes.rs
@@ -19,12 +19,14 @@ use rustc::traits;
 use rustc::ty::steal::Steal;
 use rustc::ty::{self, AllArenas, GlobalCtxt, ResolverOutputs, TyCtxt};
 use rustc::util::common::{time, ErrorReported};
+use rustc_builtin_macros;
 use rustc_codegen_ssa::back::link::emit_metadata;
 use rustc_codegen_utils::codegen_backend::CodegenBackend;
 use rustc_codegen_utils::link::filename_for_metadata;
 use rustc_data_structures::sync::{par_iter, Lrc, Once, ParallelIterator, WorkerLocal};
 use rustc_data_structures::{box_region_allow_access, declare_box_region_type, parallel};
 use rustc_errors::PResult;
+use rustc_expand::base::ExtCtxt;
 use rustc_incremental;
 use rustc_mir as mir;
 use rustc_parse::{parse_crate_from_file, parse_crate_from_source_str};
@@ -39,8 +41,6 @@ use syntax::mut_visit::MutVisitor;
 use syntax::symbol::Symbol;
 use syntax::util::node_count::NodeCounter;
 use syntax::{self, ast, visit};
-use syntax_expand::base::ExtCtxt;
-use syntax_ext;
 use syntax_pos::FileName;
 
 use rustc_serialize::json;
@@ -164,14 +164,14 @@ pub fn register_plugins<'a>(
     crate_name: &str,
 ) -> Result<(ast::Crate, Lrc<lint::LintStore>)> {
     krate = time(sess, "attributes injection", || {
-        syntax_ext::cmdline_attrs::inject(
+        rustc_builtin_macros::cmdline_attrs::inject(
             krate,
             &sess.parse_sess,
             &sess.opts.debugging_opts.crate_attr,
         )
     });
 
-    let (krate, features) = syntax_expand::config::features(
+    let (krate, features) = rustc_expand::config::features(
         krate,
         &sess.parse_sess,
         sess.edition(),
@@ -243,11 +243,11 @@ fn configure_and_expand_inner<'a>(
     });
 
     let mut resolver = Resolver::new(sess, &krate, crate_name, metadata_loader, &resolver_arenas);
-    syntax_ext::register_builtin_macros(&mut resolver, sess.edition());
+    rustc_builtin_macros::register_builtin_macros(&mut resolver, sess.edition());
 
     krate = time(sess, "crate injection", || {
         let alt_std_name = sess.opts.alt_std_name.as_ref().map(|s| Symbol::intern(s));
-        let (krate, name) = syntax_ext::standard_library_imports::inject(
+        let (krate, name) = rustc_builtin_macros::standard_library_imports::inject(
             krate,
             &mut resolver,
             &sess.parse_sess,
@@ -297,12 +297,12 @@ fn configure_and_expand_inner<'a>(
 
         // Create the config for macro expansion
         let features = sess.features_untracked();
-        let cfg = syntax_expand::expand::ExpansionConfig {
+        let cfg = rustc_expand::expand::ExpansionConfig {
             features: Some(&features),
             recursion_limit: *sess.recursion_limit.get(),
             trace_mac: sess.opts.debugging_opts.trace_macros,
             should_test: sess.opts.test,
-            ..syntax_expand::expand::ExpansionConfig::default(crate_name.to_string())
+            ..rustc_expand::expand::ExpansionConfig::default(crate_name.to_string())
         };
 
         let mut ecx = ExtCtxt::new(&sess.parse_sess, cfg, &mut resolver);
@@ -332,7 +332,7 @@ fn configure_and_expand_inner<'a>(
     });
 
     time(sess, "maybe building test harness", || {
-        syntax_ext::test_harness::inject(
+        rustc_builtin_macros::test_harness::inject(
             &sess.parse_sess,
             &mut resolver,
             sess.opts.test,
@@ -380,7 +380,7 @@ fn configure_and_expand_inner<'a>(
         krate = time(sess, "maybe creating a macro crate", || {
             let num_crate_types = crate_types.len();
             let is_test_crate = sess.opts.test;
-            syntax_ext::proc_macro_harness::inject(
+            rustc_builtin_macros::proc_macro_harness::inject(
                 &sess.parse_sess,
                 &mut resolver,
                 krate,
diff --git a/src/librustc_metadata/Cargo.toml b/src/librustc_metadata/Cargo.toml
index 7198744b69c..e22a8088654 100644
--- a/src/librustc_metadata/Cargo.toml
+++ b/src/librustc_metadata/Cargo.toml
@@ -22,7 +22,7 @@ rustc_index = { path = "../librustc_index" }
 rustc_serialize = { path = "../libserialize", package = "serialize" }
 stable_deref_trait = "1.0.0"
 syntax = { path = "../libsyntax" }
-syntax_expand = { path = "../librustc_expand", package = "rustc_expand" }
+rustc_expand = { path = "../librustc_expand" }
 rustc_parse = { path = "../librustc_parse" }
 syntax_pos = { path = "../librustc_span", package = "rustc_span" }
 rustc_error_codes = { path = "../librustc_error_codes" }
diff --git a/src/librustc_metadata/creader.rs b/src/librustc_metadata/creader.rs
index 80d7e71e96b..88ad5aba88e 100644
--- a/src/librustc_metadata/creader.rs
+++ b/src/librustc_metadata/creader.rs
@@ -22,13 +22,13 @@ use std::{cmp, fs};
 
 use log::{debug, info, log_enabled};
 use proc_macro::bridge::client::ProcMacro;
+use rustc_expand::base::SyntaxExtension;
 use syntax::ast;
 use syntax::attr;
 use syntax::edition::Edition;
 use syntax::expand::allocator::{global_allocator_spans, AllocatorKind};
 use syntax::span_fatal;
 use syntax::symbol::{sym, Symbol};
-use syntax_expand::base::SyntaxExtension;
 use syntax_pos::{Span, DUMMY_SP};
 
 use rustc_error_codes::*;
diff --git a/src/librustc_metadata/rmeta/decoder.rs b/src/librustc_metadata/rmeta/decoder.rs
index 0af47bda4b3..5b25e192f90 100644
--- a/src/librustc_metadata/rmeta/decoder.rs
+++ b/src/librustc_metadata/rmeta/decoder.rs
@@ -33,12 +33,12 @@ use std::u32;
 
 use log::debug;
 use proc_macro::bridge::client::ProcMacro;
+use rustc_expand::base::{SyntaxExtension, SyntaxExtensionKind};
+use rustc_expand::proc_macro::{AttrProcMacro, BangProcMacro, ProcMacroDerive};
 use rustc_serialize::{opaque, Decodable, Decoder, SpecializedDecoder};
 use syntax::ast::{self, Ident};
 use syntax::attr;
 use syntax::source_map::{self, respan, Spanned};
-use syntax_expand::base::{SyntaxExtension, SyntaxExtensionKind};
-use syntax_expand::proc_macro::{AttrProcMacro, BangProcMacro, ProcMacroDerive};
 use syntax_pos::symbol::{sym, Symbol};
 use syntax_pos::{self, hygiene::MacroKind, BytePos, Pos, Span, DUMMY_SP};
 
diff --git a/src/librustc_parse/config.rs b/src/librustc_parse/config.rs
index 1ff2003e82c..63892eb8995 100644
--- a/src/librustc_parse/config.rs
+++ b/src/librustc_parse/config.rs
@@ -1,7 +1,7 @@
 //! Process the potential `cfg` attributes on a module.
 //! Also determine if the module should be included in this configuration.
 //!
-//! This module properly belongs in syntax_expand, but for now it's tied into
+//! This module properly belongs in rustc_expand, but for now it's tied into
 //! parsing, so we leave it here to avoid complicated out-of-line dependencies.
 //!
 //! A principled solution to this wrong location would be to implement [#64197].
diff --git a/src/librustc_resolve/Cargo.toml b/src/librustc_resolve/Cargo.toml
index d40b2cb3660..0efc0de3a67 100644
--- a/src/librustc_resolve/Cargo.toml
+++ b/src/librustc_resolve/Cargo.toml
@@ -14,7 +14,7 @@ doctest = false
 bitflags = "1.2.1"
 log = "0.4"
 syntax = { path = "../libsyntax" }
-syntax_expand = { path = "../librustc_expand", package = "rustc_expand" }
+rustc_expand = { path = "../librustc_expand" }
 rustc = { path = "../librustc" }
 arena = { path = "../libarena" }
 errors = { path = "../librustc_errors", package = "rustc_errors" }
diff --git a/src/librustc_resolve/build_reduced_graph.rs b/src/librustc_resolve/build_reduced_graph.rs
index fed4202d961..786f1faaecb 100644
--- a/src/librustc_resolve/build_reduced_graph.rs
+++ b/src/librustc_resolve/build_reduced_graph.rs
@@ -29,6 +29,8 @@ use std::ptr;
 
 use errors::Applicability;
 
+use rustc_expand::base::SyntaxExtension;
+use rustc_expand::expand::AstFragment;
 use syntax::ast::{self, Block, ForeignItem, ForeignItemKind, Item, ItemKind, NodeId};
 use syntax::ast::{AssocItem, AssocItemKind, MetaItemKind, StmtKind};
 use syntax::ast::{Ident, Name};
@@ -38,8 +40,6 @@ use syntax::span_err;
 use syntax::symbol::{kw, sym};
 use syntax::token::{self, Token};
 use syntax::visit::{self, Visitor};
-use syntax_expand::base::SyntaxExtension;
-use syntax_expand::expand::AstFragment;
 use syntax_pos::hygiene::{ExpnId, MacroKind};
 use syntax_pos::{Span, DUMMY_SP};
 
diff --git a/src/librustc_resolve/def_collector.rs b/src/librustc_resolve/def_collector.rs
index 2e3eb12d917..e76f1f82f65 100644
--- a/src/librustc_resolve/def_collector.rs
+++ b/src/librustc_resolve/def_collector.rs
@@ -1,11 +1,11 @@
 use log::debug;
 use rustc::hir::def_id::DefIndex;
 use rustc::hir::map::definitions::*;
+use rustc_expand::expand::AstFragment;
 use syntax::ast::*;
 use syntax::symbol::{kw, sym};
 use syntax::token::{self, Token};
 use syntax::visit;
-use syntax_expand::expand::AstFragment;
 use syntax_pos::hygiene::ExpnId;
 use syntax_pos::Span;
 
diff --git a/src/librustc_resolve/lib.rs b/src/librustc_resolve/lib.rs
index 979489319a5..f6e836011b2 100644
--- a/src/librustc_resolve/lib.rs
+++ b/src/librustc_resolve/lib.rs
@@ -36,6 +36,7 @@ use rustc::util::nodemap::{DefIdMap, FxHashMap, FxHashSet, NodeMap, NodeSet};
 use rustc_metadata::creader::{CStore, CrateLoader};
 
 use errors::{Applicability, DiagnosticBuilder};
+use rustc_expand::base::SyntaxExtension;
 use syntax::ast::{self, FloatTy, Ident, IntTy, Name, NodeId, UintTy};
 use syntax::ast::{Crate, CRATE_NODE_ID};
 use syntax::ast::{ItemKind, Path};
@@ -45,7 +46,6 @@ use syntax::source_map::Spanned;
 use syntax::symbol::{kw, sym};
 use syntax::visit::{self, Visitor};
 use syntax::{struct_span_err, unwrap_or};
-use syntax_expand::base::SyntaxExtension;
 use syntax_pos::hygiene::{ExpnId, ExpnKind, MacroKind, SyntaxContext, Transparency};
 use syntax_pos::{Span, DUMMY_SP};
 
diff --git a/src/librustc_resolve/macros.rs b/src/librustc_resolve/macros.rs
index 08a03c6b213..580dbad5724 100644
--- a/src/librustc_resolve/macros.rs
+++ b/src/librustc_resolve/macros.rs
@@ -12,16 +12,16 @@ use rustc::middle::stability;
 use rustc::session::Session;
 use rustc::util::nodemap::FxHashSet;
 use rustc::{lint, span_bug, ty};
+use rustc_expand::base::SyntaxExtension;
+use rustc_expand::base::{self, Indeterminate, InvocationRes};
+use rustc_expand::compile_declarative_macro;
+use rustc_expand::expand::{AstFragment, AstFragmentKind, Invocation, InvocationKind};
 use rustc_feature::is_builtin_attr_name;
 use syntax::ast::{self, Ident, NodeId};
 use syntax::attr::{self, StabilityLevel};
 use syntax::edition::Edition;
 use syntax::feature_gate::feature_err;
 use syntax::print::pprust;
-use syntax_expand::base::SyntaxExtension;
-use syntax_expand::base::{self, Indeterminate, InvocationRes};
-use syntax_expand::compile_declarative_macro;
-use syntax_expand::expand::{AstFragment, AstFragmentKind, Invocation, InvocationKind};
 use syntax_pos::hygiene::{self, ExpnData, ExpnId, ExpnKind};
 use syntax_pos::symbol::{kw, sym, Symbol};
 use syntax_pos::{Span, DUMMY_SP};
diff --git a/src/librustdoc/lib.rs b/src/librustdoc/lib.rs
index 23a47f3fb2f..fb289f8ab8a 100644
--- a/src/librustdoc/lib.rs
+++ b/src/librustdoc/lib.rs
@@ -25,7 +25,7 @@ extern crate rustc;
 extern crate rustc_data_structures;
 extern crate rustc_driver;
 extern crate rustc_error_codes;
-extern crate rustc_expand as syntax_expand;
+extern crate rustc_expand;
 extern crate rustc_feature;
 extern crate rustc_index;
 extern crate rustc_interface;
diff --git a/src/librustdoc/passes/collect_intra_doc_links.rs b/src/librustdoc/passes/collect_intra_doc_links.rs
index af850a34467..75a87e7cc5d 100644
--- a/src/librustdoc/passes/collect_intra_doc_links.rs
+++ b/src/librustdoc/passes/collect_intra_doc_links.rs
@@ -8,12 +8,12 @@ use rustc::hir::def::{
 use rustc::hir::def_id::DefId;
 use rustc::lint;
 use rustc::ty;
+use rustc_expand::base::SyntaxExtensionKind;
 use rustc_feature::UnstableFeatures;
 use rustc_resolve::ParentScope;
 use syntax;
 use syntax::ast::{self, Ident};
 use syntax::symbol::Symbol;
-use syntax_expand::base::SyntaxExtensionKind;
 use syntax_pos::DUMMY_SP;
 
 use std::ops::Range;
diff --git a/src/test/ui-fulldeps/auxiliary/macro-crate-test.rs b/src/test/ui-fulldeps/auxiliary/macro-crate-test.rs
index ee82c0adc86..fa136fd54c2 100644
--- a/src/test/ui-fulldeps/auxiliary/macro-crate-test.rs
+++ b/src/test/ui-fulldeps/auxiliary/macro-crate-test.rs
@@ -7,7 +7,6 @@
 extern crate syntax;
 extern crate rustc;
 extern crate rustc_driver;
-extern crate syntax_pos;
 extern crate proc_macro;
 
 use proc_macro::{TokenTree, TokenStream};
diff --git a/src/test/ui-fulldeps/mod_dir_path_canonicalized.rs b/src/test/ui-fulldeps/mod_dir_path_canonicalized.rs
index cf675831cfe..51aa5f24e4c 100644
--- a/src/test/ui-fulldeps/mod_dir_path_canonicalized.rs
+++ b/src/test/ui-fulldeps/mod_dir_path_canonicalized.rs
@@ -5,7 +5,6 @@
 #![feature(rustc_private)]
 
 extern crate syntax;
-extern crate syntax_expand;
 extern crate rustc_parse;
 
 use rustc_parse::new_parser_from_file;
diff --git a/src/test/ui-fulldeps/pprust-expr-roundtrip.rs b/src/test/ui-fulldeps/pprust-expr-roundtrip.rs
index 36d47cea13b..59813322e5b 100644
--- a/src/test/ui-fulldeps/pprust-expr-roundtrip.rs
+++ b/src/test/ui-fulldeps/pprust-expr-roundtrip.rs
@@ -21,7 +21,6 @@
 
 extern crate rustc_data_structures;
 extern crate syntax;
-extern crate syntax_expand;
 extern crate rustc_parse;
 
 use rustc_data_structures::thin_vec::ThinVec;