2c6440e2a2
It was considered to be impossible but actually it can happen for nested closures. Also, because there must be nested closures when this happens, we can use more targeted help message. Closes #21390 Closes #21600
28 lines
904 B
Rust
28 lines
904 B
Rust
// Copyright 2015 The Rust Project Developers. See the COPYRIGHT
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// file at the top-level directory of this distribution and at
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// http://rust-lang.org/COPYRIGHT.
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//
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// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
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// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
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// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
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// option. This file may not be copied, modified, or distributed
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// except according to those terms.
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fn call_it<F>(f: F) where F: Fn() { f(); }
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struct A;
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impl A {
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fn gen(&self) {}
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fn gen_mut(&mut self) {}
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}
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fn main() {
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let mut x = A;
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call_it(|| { //~ HELP consider changing this to accept closures that implement `FnMut`
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call_it(|| x.gen());
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call_it(|| x.gen_mut()); //~ ERROR cannot borrow data mutably in a captured outer
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//~^ ERROR cannot borrow data mutably in a captured outer
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});
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}
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