| // 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, |
| // but we forgot the mut. |
| let tick1 = || { |
| counter += 1; |
| }; |
| |
| // In turn, tick2 must be inferred to FnMut so that it can call |
| // tick1, but we forgot the mut. The error message we currently |
| // get seems... suboptimal. |
| let tick2 = || { //~ ERROR closure cannot assign to immutable local variable `tick1` |
| tick1(); |
| }; |
| |
| tick2(); //~ ERROR cannot borrow |
| } |
