File: suggest-as-ref-on-mut-closure.rs

package info (click to toggle)
rustc 1.89.0%2Bdfsg1-1
  • links: PTS, VCS
  • area: main
  • in suites: forky, sid
  • size: 906,624 kB
  • sloc: xml: 158,148; python: 34,888; javascript: 19,595; sh: 19,221; ansic: 13,046; cpp: 7,144; asm: 4,376; makefile: 692; lisp: 174; sql: 15
file content (16 lines) | stat: -rw-r--r-- 479 bytes parent folder | download | duplicates (18) 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
 
// This is not exactly right, yet.

// Ideally we should be suggesting `as_mut` for the first case,
// and suggesting to change `as_ref` to `as_mut` in the second.

fn x(cb: &mut Option<&mut dyn FnMut()>) {
    cb.map(|cb| cb());
    //~^ ERROR cannot move out of `*cb` which is behind a mutable reference
}

fn x2(cb: &mut Option<&mut dyn FnMut()>) {
    cb.as_ref().map(|cb| cb());
    //~^ ERROR cannot borrow `*cb` as mutable, as it is behind a `&` reference
}

fn main() {}