src/test/compile-fail/issue-21659-show-relevant-trait-impls-1.rs

   1 // Copyright 2015 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.
   4 //
   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.
  10
  11 trait Foo<A> {
  12     fn foo(&self, a: A) -> A {
  13         a
  14     }
  15 }
  16
  17 trait NotRelevant<A> {
  18     fn nr(&self, a: A) -> A {
  19         a
  20     }
  21 }
  22
  23 struct Bar;
  24
  25 impl Foo<i32> for Bar {}
  26
  27 impl Foo<u8> for Bar {}
  28
  29 impl NotRelevant<usize> for Bar {}
  30
  31 fn main() {
  32     let f1 = Bar;
  33
  34     f1.foo(1usize);
  35     //~^ error: the trait bound `Bar: Foo<usize>` is not satisfied
  36     //~| help: the following implementations were found:
  37     //~| help:   <Bar as Foo<i32>>
  38     //~| help:   <Bar as Foo<u8>>
  39     //~| help: run `rustc --explain E0277`
  40 }