38 lines
1.1 KiB
Rust
38 lines
1.1 KiB
Rust
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// Copyright 2016 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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// Regression test for #41677. The local variable was winding up with
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// a type `Receiver<?T, H>` where `?T` was unconstrained, because we
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// failed to enforce the WF obligations and `?T` is a bivariant type
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// parameter position.
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#![allow(unused_variables, dead_code)]
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use std::marker::PhantomData;
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trait Handle {
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type Inner;
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}
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struct ResizingHandle<H>(PhantomData<H>);
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impl<H> Handle for ResizingHandle<H> {
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type Inner = H;
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}
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struct Receiver<T, H: Handle<Inner=T>>(PhantomData<H>);
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fn channel<T>(size: usize) -> Receiver<T, ResizingHandle<T>> {
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let rx = Receiver(PhantomData);
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rx
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}
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fn main() {
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}
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