41 lines
1.1 KiB
Rust
41 lines
1.1 KiB
Rust
// Copyright 2018 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 that `impl MyTrait<'_> for &i32` is equivalent to `impl<'a,
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// 'b> MyTrait<'a> for &'b i32`.
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#![allow(warnings)]
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use std::fmt::Debug;
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// Equivalent to `Box<dyn Debug + 'static>`:
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trait StaticTrait { }
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impl StaticTrait for Box<dyn Debug> { }
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// Equivalent to `Box<dyn Debug + 'static>`:
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trait NotStaticTrait { }
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impl NotStaticTrait for Box<dyn Debug + '_> { }
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fn static_val<T: StaticTrait>(_: T) {
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}
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fn with_dyn_debug_static<'a>(x: Box<dyn Debug + 'a>) {
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static_val(x); //~ ERROR cannot infer
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}
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fn not_static_val<T: NotStaticTrait>(_: T) {
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}
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fn with_dyn_debug_not_static<'a>(x: Box<dyn Debug + 'a>) {
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not_static_val(x); // OK
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}
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fn main() {
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}
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