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error[E0507]: cannot move out of `*v`, as `v` is a captured variable in an `FnMut` closure
--> $DIR/issue-4335.rs:6:20
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LL | fn f<'r, T>(v: &'r T) -> Box<dyn FnMut() -> T + 'r> {
| - ----- move occurs because `*v` has type `T`, which does not implement the `Copy` trait
| |
| captured outer variable
LL | id(Box::new(|| *v))
| -- ^^ `*v` is moved here
| |
| captured by this `FnMut` closure
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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
help: if `T` implemented `Clone`, you could clone the value
--> $DIR/issue-4335.rs:5:10
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LL | fn f<'r, T>(v: &'r T) -> Box<dyn FnMut() -> T + 'r> {
| ^ consider constraining this type parameter with `Clone`
LL | id(Box::new(|| *v))
| -- you could clone this value
error: aborting due to 1 previous error
For more information about this error, try `rustc --explain E0507`.
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