23 lines
645 B
Rust
23 lines
645 B
Rust
// Copyright 2014-2018 The Rust Project Developers. See the COPYRIGHT
|
|
// file at the top-level directory of this distribution.
|
|
//
|
|
// 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.
|
|
|
|
pub trait FooMap {
|
|
fn map<B, F: Fn() -> B>(&self, f: F) -> B;
|
|
}
|
|
|
|
impl FooMap for bool {
|
|
fn map<B, F: Fn() -> B>(&self, f: F) -> B {
|
|
f()
|
|
}
|
|
}
|
|
|
|
fn main() {
|
|
let a = true;
|
|
a.map(|| false);
|
|
}
|