Add item_like_imports feature.

Author: jseyfried

src/librustc_resolve/lib.rs

@@ -1053,6 +1053,7 @@ pub struct Resolver<'a> {
 
     arenas: &'a ResolverArenas<'a>,
     dummy_binding: &'a NameBinding<'a>,
+    new_import_semantics: bool, // true if `#![feature(item_like_imports)]`
 }
 
 pub struct ResolverArenas<'a> {
@@ -1209,6 +1210,7 @@ impl<'a> Resolver<'a> {
                 span: DUMMY_SP,
                 vis: ty::Visibility::Public,
             }),
+            new_import_semantics: session.features.borrow().item_like_imports,
         }
     }
 

src/libsyntax/feature_gate.rs

@@ -285,7 +285,10 @@ declare_features! (
 
     // Allows the sysV64 ABI to be specified on all platforms
     // instead of just the platforms on which it is the C ABI
-    (active, abi_sysv64, "1.13.0", Some(36167))
+    (active, abi_sysv64, "1.13.0", Some(36167)),
+
+    // Use the import semantics from RFC 1560.
+    (active, item_like_imports, "1.13.0", Some(35120))
 );
 
 declare_features! (