Fallout in tests -- break test into a run-pass and compile-fail component

Author: nikomatsakis

src/test/compile-fail/associated-types-projection-to-unrelated-trait-in-method-without-default.rs

@@ -0,0 +1,39 @@
+// 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.
+
+// Check that we get an error when you use `<Self as Get>::Value` in
+// the trait definition even if there is no default method.
+
+trait Get {
+    type Value;
+}
+
+trait Other {
+    fn okay<U:Get>(&self, foo: U, bar: <Self as Get>::Value);
+    //~^ ERROR E0277
+}
+
+impl Get for () {
+    type Value = f32;
+}
+
+impl Get for f64 {
+    type Value = u32;
+}
+
+impl Other for () {
+    fn okay<U:Get>(&self, _foo: U, _bar: <Self as Get>::Value) { }
+}
+
+impl Other for f64 {
+    fn okay<U:Get>(&self, _foo: U, _bar: <Self as Get>::Value) { }
+}
+
+fn main() { }

src/test/run-pass/associated-types-projection-to-unrelated-trait.rs

@@ -21,7 +21,8 @@ trait Get {
 }
 
 trait Other {
-    fn okay<U:Get>(&self, foo: U, bar: <Self as Get>::Value);
+    fn okay<U:Get>(&self, foo: U, bar: <Self as Get>::Value)
+        where Self: Get;
 }
 
 impl Get for () {