44 lines
1.1 KiB
Rust
44 lines
1.1 KiB
Rust
// Copyright 2012-2018 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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// compile-pass
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#![feature(const_let)]
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#![feature(underscore_const_names)]
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trait Trt {}
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struct Str {}
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impl Trt for Str {}
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macro_rules! check_impl {
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($struct:ident,$trait:ident) => {
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const _ : () = {
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use std::marker::PhantomData;
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struct ImplementsTrait<T: $trait>(PhantomData<T>);
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let _ = ImplementsTrait::<$struct>(PhantomData);
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()
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};
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}
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}
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#[deny(unused)]
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const _ : () = ();
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const _ : i32 = 42;
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const _ : Str = Str{};
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check_impl!(Str, Trt);
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check_impl!(Str, Trt);
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fn main() {
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check_impl!(Str, Trt);
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check_impl!(Str, Trt);
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}
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