40 lines
978 B
Rust
40 lines
978 B
Rust
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// Copyright 2015 The Rust Project Developers. See the COPYRIGHT
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// file at the top-level directory of this distribution and at
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// http://rust-lang.org/COPYRIGHT.
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//
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// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
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// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
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// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
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// option. This file may not be copied, modified, or distributed
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// except according to those terms.
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trait Foo<A> {
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fn foo(&self, a: A) -> A {
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a
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}
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}
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trait NotRelevant<A> {
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fn nr(&self, a: A) -> A {
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a
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}
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}
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struct Bar;
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impl Foo<i32> for Bar {}
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impl Foo<u8> for Bar {}
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impl NotRelevant<usize> for Bar {}
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fn main() {
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let f1 = Bar;
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f1.foo(1usize);
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//~^ error: the trait `Foo<usize>` is not implemented for the type `Bar`
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// | help: the following implementations were found:
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// | help: implementation 1: `Foo<i32>`
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// | help: implementation 2: `Foo<u8>`
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}
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