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

package info (click to toggle)
rustc 1.85.0%2Bdfsg3-1
  • links: PTS, VCS
  • area: main
  • in suites: experimental, sid, trixie
  • size: 893,396 kB
  • sloc: xml: 158,127; python: 35,830; javascript: 19,497; cpp: 19,002; sh: 17,245; ansic: 13,127; asm: 4,376; makefile: 1,051; perl: 29; lisp: 29; ruby: 19; sql: 11
file content (16 lines) | stat: -rw-r--r-- 479 bytes parent folder | download | duplicates (8) 
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() {}