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// Copyright 2018 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.
// compile-pass
pub trait Foo<'a> {
type Bar;
fn foo(&'a self) -> Self::Bar;
}
impl<'a, 'b, T: 'a> Foo<'a> for &'b T {
type Bar = &'a T;
fn foo(&'a self) -> &'a T {
self
}
}
pub fn uncallable<T, F>(x: T, f: F)
where T: for<'a> Foo<'a>,
F: for<'a> Fn(<T as Foo<'a>>::Bar)
{
f(x.foo());
}
pub fn catalyst(x: &i32) {
broken(x, |_| {})
}
pub fn broken<F: Fn(&i32)>(x: &i32, f: F) {
uncallable(x, |y| f(y));
}
fn main() { }
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