Keep crate edition in metadata

src/librustc/middle/cstore.rs

@@ -34,6 +34,7 @@ use session::search_paths::PathKind;
 use std::any::Any;
 use std::path::{Path, PathBuf};
 use syntax::ast;
+use syntax::edition::Edition;
 use syntax::ext::base::SyntaxExtension;
 use syntax::symbol::Symbol;
 use syntax_pos::Span;
@@ -235,6 +236,7 @@ pub trait CrateStore {
     fn crate_name_untracked(&self, cnum: CrateNum) -> Symbol;
     fn crate_disambiguator_untracked(&self, cnum: CrateNum) -> CrateDisambiguator;
     fn crate_hash_untracked(&self, cnum: CrateNum) -> Svh;
+    fn crate_edition_untracked(&self, cnum: CrateNum) -> Edition;
     fn struct_field_names_untracked(&self, def: DefId) -> Vec<ast::Name>;
     fn item_children_untracked(&self, did: DefId, sess: &Session) -> Vec<def::Export>;
     fn load_macro_untracked(&self, did: DefId, sess: &Session) -> LoadedMacro;
@@ -309,6 +311,7 @@ impl CrateStore for DummyCrateStore {
         bug!("crate_disambiguator")
     }
     fn crate_hash_untracked(&self, cnum: CrateNum) -> Svh { bug!("crate_hash") }
+    fn crate_edition_untracked(&self, cnum: CrateNum) -> Edition { bug!("crate_edition_untracked") }
 
     // resolve
     fn def_key(&self, def: DefId) -> DefKey { bug!("def_key") }

src/librustc_metadata/cstore.rs

@@ -24,6 +24,7 @@ use rustc::util::nodemap::{FxHashMap, NodeMap};
 
 use rustc_data_structures::sync::{Lrc, RwLock, Lock};
 use syntax::{ast, attr};
+use syntax::edition::Edition;
 use syntax::ext::base::SyntaxExtension;
 use syntax::symbol::Symbol;
 use syntax_pos;
@@ -234,4 +235,8 @@ impl CrateMetadata {
     pub fn panic_strategy(&self) -> PanicStrategy {
         self.root.panic_strategy.clone()
     }
+
+    pub fn edition(&self) -> Edition {
+        self.root.edition
+    }
 }

src/librustc_metadata/cstore_impl.rs

@@ -38,6 +38,7 @@ use std::sync::Arc;
 use syntax::ast;
 use syntax::attr;
 use syntax::codemap;
+use syntax::edition::Edition;
 use syntax::ext::base::SyntaxExtension;
 use syntax::parse::filemap_to_stream;
 use syntax::symbol::Symbol;
@@ -464,6 +465,11 @@ impl CrateStore for cstore::CStore {
         self.get_crate_data(cnum).hash()
     }
 
+    fn crate_edition_untracked(&self, cnum: CrateNum) -> Edition
+    {
+        self.get_crate_data(cnum).edition()
+    }
+
     /// Returns the `DefKey` for a given `DefId`. This indicates the
     /// parent `DefId` as well as some idea of what kind of data the
     /// `DefId` refers to.

src/librustc_metadata/encoder.rs

@@ -44,7 +44,7 @@ use syntax::ast::{self, CRATE_NODE_ID};
 use syntax::codemap::Spanned;
 use syntax::attr;
 use syntax::symbol::Symbol;
-use syntax_pos::{self, FileName, FileMap, Span, DUMMY_SP};
+use syntax_pos::{self, hygiene, FileName, FileMap, Span, DUMMY_SP};
 
 use rustc::hir::{self, PatKind};
 use rustc::hir::itemlikevisit::ItemLikeVisitor;
@@ -496,6 +496,7 @@ impl<'a, 'tcx> EncodeContext<'a, 'tcx> {
             hash: link_meta.crate_hash,
             disambiguator: tcx.sess.local_crate_disambiguator(),
             panic_strategy: tcx.sess.panic_strategy(),
+            edition: hygiene::default_edition(),
             has_global_allocator: has_global_allocator,
             has_default_lib_allocator: has_default_lib_allocator,
             plugin_registrar_fn: tcx.sess

src/librustc_metadata/schema.rs

@@ -23,6 +23,7 @@ use rustc_target::spec::{PanicStrategy, TargetTriple};
 
 use rustc_serialize as serialize;
 use syntax::{ast, attr};
+use syntax::edition::Edition;
 use syntax::symbol::Symbol;
 use syntax_pos::{self, Span};
 
@@ -189,6 +190,7 @@ pub struct CrateRoot {
     pub hash: hir::svh::Svh,
     pub disambiguator: CrateDisambiguator,
     pub panic_strategy: PanicStrategy,
+    pub edition: Edition,
     pub has_global_allocator: bool,
     pub has_default_lib_allocator: bool,
     pub plugin_registrar_fn: Option<DefIndex>,