rust/tests/ui/borrowck/suggest-as-ref-on-mut-closure.rs
2023-01-11 09:32:08 +00:00

17 lines
479 B
Rust

// 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() {}