27 lines
758 B
Rust
27 lines
758 B
Rust
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// Copyright 2017 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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// regression test for issue #41498.
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struct S;
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impl S {
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fn mutate(&mut self) {}
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}
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fn call_and_ref<T, F: FnOnce() -> T>(x: &mut Option<T>, f: F) -> &mut T {
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*x = Some(f());
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x.as_mut().unwrap()
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}
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fn main() {
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let mut n = None;
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call_and_ref(&mut n, || [S])[0].mutate();
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}
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