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error[E0277]: the size for values of type `dyn ToString` cannot be known at compilation time
--> $DIR/issue-58355.rs:5:14
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LL | x = Some(Box::new(callback));
| ^^^^^^^^^^^^^^^^^^ doesn't have a size known at compile-time
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= help: within `fn() -> dyn ToString`, the trait `Sized` is not implemented for `dyn ToString`
= note: required because it appears within the type `fn() -> dyn ToString`
= note: required for the cast from `Box<fn() -> dyn ToString>` to `Box<dyn Fn() -> (dyn ToString + 'static)>`
error: aborting due to 1 previous error
For more information about this error, try `rustc --explain E0277`.
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