| // 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() { } |
| |
