38 lines
1.1 KiB
Rust
38 lines
1.1 KiB
Rust
// Copyright 2014 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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// Test a case where you have an impl of `Foo<X>` for all `X` that
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// is being applied to `for<'a> Foo<&'a mut X>`. Issue #19730.
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trait Foo<X> {
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fn foo(&self, x: X) { }
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}
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fn want_hrtb<T>()
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where T : for<'a> Foo<&'a int>
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{
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}
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// AnyInt implements Foo<&'a int> for any 'a, so it is a match.
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struct AnyInt;
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impl<'a> Foo<&'a int> for AnyInt { }
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fn give_any() {
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want_hrtb::<AnyInt>()
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}
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// StaticInt only implements Foo<&'static int>, so it is an error.
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struct StaticInt;
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impl Foo<&'static int> for StaticInt { }
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fn give_static() {
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want_hrtb::<StaticInt>() //~ ERROR `for<'a> Foo<&'a int>` is not implemented
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}
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fn main() { }
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