rust/tests/ui/suggestions/option-content-move3.rs
Esteban Küber ad9a5a5f9f Suggest cloning captured binding in move closure
```
error[E0507]: cannot move out of `bar`, a captured variable in an `FnMut` closure
  --> $DIR/borrowck-move-by-capture.rs:9:29
   |
LL |     let bar: Box<_> = Box::new(3);
   |         --- captured outer variable
LL |     let _g = to_fn_mut(|| {
   |                        -- captured by this `FnMut` closure
LL |         let _h = to_fn_once(move || -> isize { *bar });
   |                             ^^^^^^^^^^^^^^^^   ----
   |                             |                  |
   |                             |                  variable moved due to use in closure
   |                             |                  move occurs because `bar` has type `Box<isize>`, which does not implement the `Copy` trait
   |                             `bar` is moved here
   |
help: clone the value before moving it into the closure
   |
LL ~         let value = bar.clone();
LL ~         let _h = to_fn_once(move || -> isize { value });
   |
```
2024-04-24 22:21:16 +00:00

31 lines
706 B
Rust

#[derive(Debug)]
struct NotCopyable;
#[derive(Debug, Clone)]
struct NotCopyableButCloneable;
fn func<F: FnMut() -> H, H: FnMut()>(_: F) {}
fn foo() {
let var = NotCopyable;
func(|| {
// Shouldn't suggest `move ||.as_ref()` here
move || { //~ ERROR cannot move out of `var`
let x = var; //~ ERROR cannot move out of `var`
println!("{x:?}");
}
});
}
fn bar() {
let var = NotCopyableButCloneable;
func(|| {
// Shouldn't suggest `move ||.as_ref()` here
move || { //~ ERROR cannot move out of `var`
let x = var; //~ ERROR cannot move out of `var`
println!("{x:?}");
}
});
}
fn main() {}