a80d329b68
They are already gated with feature `fn_traits`
29 lines
917 B
Rust
29 lines
917 B
Rust
// Copyright 2015 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.
|
|
|
|
// Test that we are able to infer a suitable kind for this closure
|
|
// that is just called (`FnMut`).
|
|
|
|
fn main() {
|
|
let mut counter = 0;
|
|
|
|
{
|
|
// Here this must be inferred to FnMut so that it can mutate counter:
|
|
let mut tick1 = || counter += 1;
|
|
|
|
// In turn, tick2 must be inferred to FnMut so that it can call tick1:
|
|
let mut tick2 = || { tick1(); tick1(); };
|
|
|
|
tick2();
|
|
}
|
|
|
|
assert_eq!(counter, 2);
|
|
}
|