[rustc.git] / src / test / run-pass / issue-41498.rs

// Copyright 2017 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.

// regression test for issue #41498.

struct S;
impl S {
    fn mutate(&mut self) {}
}

fn call_and_ref<T, F: FnOnce() -> T>(x: &mut Option<T>, f: F) -> &mut T {
    *x = Some(f());
    x.as_mut().unwrap()
}

fn main() {
    let mut n = None;
    call_and_ref(&mut n, || [S])[0].mutate();
}
Commit	Line	Data
8bb4bdeb	1	// Copyright 2017 The Rust Project Developers. See the COPYRIGHT
223e47cc LB	2	// file at the top-level directory of this distribution and at
	3	// http://rust-lang.org/COPYRIGHT.
	4	//
	5	// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
	6	// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
	7	// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
	8	// option. This file may not be copied, modified, or distributed
	9	// except according to those terms.
	10
cc61c64b XL	11	// regression test for issue #41498.
	12
	13	struct S;
	14	impl S {
	15	fn mutate(&mut self) {}
	16	}
	17
	18	fn call_and_ref<T, F: FnOnce() -> T>(x: &mut Option<T>, f: F) -> &mut T {
	19	*x = Some(f());
	20	x.as_mut().unwrap()
	21	}
	22
7453a54e	23	fn main() {
cc61c64b XL	24	let mut n = None;
cc61c64b XL	25	call_and_ref(&mut n, \|\| [S])[0].mutate();
223e47cc	26	}