rust/src/test/compile-fail/unboxed-closures-infer-fnmut-missing-mut.rs

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// 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;
let tick = || counter += 1;
tick(); //~ ERROR cannot borrow immutable local variable `tick` as mutable
}