Normalize bounds that we extract from where clauses. Fixes #20765.

src/test/run-pass/associated-types-projection-in-where-clause.rs

@@ -0,0 +1,34 @@
+// Copyright 2015 The Rust Project Developers. See the COPYRIGHT
+// file at the top-level directory of this distribution and at
+// http://rust-lang.org/COPYRIGHT.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+// Test a where clause that uses a non-normalized projection type.
+
+trait Int
+{
+    type T;
+}
+
+trait NonZero
+{
+    fn non_zero(self) -> bool;
+}
+
+fn foo<I:Int<T=J>,J>(t: I) -> bool
+    where <I as Int>::T : NonZero
+    //    ^~~~~~~~~~~~~ canonical form is just J
+{
+    bar::<J>()
+}
+
+fn bar<NZ:NonZero>() -> bool { true }
+
+fn main ()
+{
+}