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error[E0507]: cannot move out of `val`, a captured variable in an `FnMut` closure
--> $DIR/issue-87456-point-to-closure.rs:10:28
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LL | let val = String::new();
| --- captured outer variable
LL |
LL | take_mut(|| {
| -- captured by this `FnMut` closure
LL |
LL | let _foo: String = val;
| ^^^ move occurs because `val` has type `String`, which does not implement the `Copy` trait
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help: `Fn` and `FnMut` closures require captured values to be able to be consumed multiple times, but `FnOnce` closures may consume them only once
--> $DIR/issue-87456-point-to-closure.rs:3:24
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LL | fn take_mut(_val: impl FnMut()) {}
| ^^^^^^^
help: consider borrowing here
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LL | let _foo: String = &val;
| +
help: consider cloning the value if the performance cost is acceptable
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LL | let _foo: String = val.clone();
| ++++++++
error: aborting due to 1 previous error
For more information about this error, try `rustc --explain E0507`.
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