src/test/ui/issue-39970.rs


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// Copyright 2017 The Rust Project Developers. See the COPYRIGHT
// file at the top-level directory of this distribution and at
// http://rust-lang.org/COPYRIGHT.
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.

trait Array<'a> {
    type Element: 'a;
}

trait Visit {
    fn visit() {}
}

impl<'a> Array<'a> for () {
    type Element = &'a ();
}

impl Visit for () where
    //(): for<'a> Array<'a, Element=&'a ()>, // No ICE
    (): for<'a> Array<'a, Element=()>, // ICE
{}

fn main() {
    <() as Visit>::visit();
    //~^ ERROR type mismatch resolving `for<'a> <() as Array<'a>>::Element == ()`
}