rust/src/test/run-pass/unboxed-closures-infer-fnmut-calling-fnmut.rs
Vadim Petrochenkov a80d329b68 Don't gate methods Fn(Mut,Once)::call(mut,once) with feature unboxed_closures
They are already gated with feature `fn_traits`
2016-07-31 17:48:20 +03:00

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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);
}