a260df27e0
`try_index_step` does not resolve type variables by itself and would fail otherwise. Also harden the failure path in `confirm` to cause less confusing errors.
27 lines
758 B
Rust
27 lines
758 B
Rust
// 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();
|
|
}
|