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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
   |
LL | fn f<'r, T>(v: &'r T) -> Box<dyn FnMut() -> T + 'r> {
   |             - captured outer variable
LL |     id(Box::new(|| *v))
   |                 -- ^^ move occurs because `*v` has type `T`, which does not implement the `Copy` trait
   |                 |
   |                 captured by this `FnMut` closure

error: aborting due to previous error

For more information about this error, try `rustc --explain E0507`.