some tests featuring multiple bounds, other errors

Author: nikomatsakis

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

@@ -0,0 +1,23 @@
+// Copyright 2017 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.
+
+#![feature(universal_impl_trait)]
+
+use std::fmt::Display;
+
+fn foo(f: impl Display + Clone) -> String {
+    let g = f.clone();
+    format!("{} + {}", f, g)
+}
+
+fn main() {
+    let sum = foo(format!("22"));
+    assert_eq!(sum, r"22 + 22");
+}

src/test/ui/impl-trait/universal_wrong_bounds.rs

@@ -0,0 +1,26 @@
+// Copyright 2017 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.
+
+#![feature(universal_impl_trait)]
+
+use std::fmt::Display;
+
+fn foo(f: impl Display + Clone) -> String {
+    wants_debug(f);
+    wants_display(f);
+    wants_clone(f);
+}
+
+fn wants_debug(g: impl Debug) { }
+fn wants_display(g: impl Debug) { }
+fn wants_cone(g: impl Clone) { }
+
+fn main() {
+}