Rollup merge of rust-lang#31130 - marcbowes:master, r=nrc

E0210 explains about orphan rules and suggests using a local type as a workaround. It wasn't obvious to me that I couldn't use a type alias, so I added a note.
steveklabnik · Jan 23, 2016 · 7c22c1a · 7c22c1a
2 parents b697b3e + 97f9cad
commit 7c22c1a
Showing 1 changed file with 2 additions and 0 deletions.
diff --git a/src/librustc_typeck/diagnostics.rs b/src/librustc_typeck/diagnostics.rs
@@ -2269,6 +2269,8 @@ struct MyType<T>(T);
 impl<T> ForeignTrait for MyType<T> { ... } // Ok
 ```
 
+Please note that a type alias is not sufficient.
+
 For another example of an error, suppose there's another trait defined in `foo`
 named `ForeignTrait2` that takes two type parameters. Then this `impl` results
 in the same rule violation: