Various cleanups

src/test/run-pass/impl-trait/bounds_regression.rs

@@ -0,0 +1,32 @@
+// Copyright 2018 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.
+
+pub trait FakeGenerator {
+    type Yield;
+    type Return;
+}
+
+pub trait FakeFuture {
+    type Output;
+}
+
+pub fn future_from_generator<
+    T: FakeGenerator<Yield = ()>
+>(x: T) -> impl FakeFuture<Output = T::Return> {
+    GenFuture(x)
+}
+
+struct GenFuture<T: FakeGenerator<Yield = ()>>(T);
+
+impl<T: FakeGenerator<Yield = ()>> FakeFuture for GenFuture<T> {
+    type Output = T::Return;
+}
+
+fn main() {}