1 // Copyright 2014 The Rust Project Developers. See the COPYRIGHT
2 // file at the top-level directory of this distribution and at
3 // http://rust-lang.org/COPYRIGHT.
5 // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
6 // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
7 // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
8 // option. This file may not be copied, modified, or distributed
9 // except according to those terms.
11 #![deny(unused_results, unused_must_use)]
17 #[must_use = "some message"]
18 enum MustUseMsg { Test2 }
20 fn foo<T>() -> T { panic!() }
22 fn bar() -> isize { return foo::<isize>(); }
23 fn baz() -> MustUse { return foo::<MustUse>(); }
24 fn qux() -> MustUseMsg { return foo::<MustUseMsg>(); }
26 #[allow(unused_results)]
29 foo::<MustUse>(); //~ ERROR: unused `MustUse` which must be used
30 foo::<MustUseMsg>(); //~ ERROR: unused `MustUseMsg` which must be used: some message
33 #[allow(unused_results, unused_must_use)]
41 foo::<isize>(); //~ ERROR: unused result
42 foo::<MustUse>(); //~ ERROR: unused `MustUse` which must be used
43 foo::<MustUseMsg>(); //~ ERROR: unused `MustUseMsg` which must be used: some message
45 let _ = foo::<isize>();
46 let _ = foo::<MustUse>();
47 let _ = foo::<MustUseMsg>();