1 error[E0277]: the size for values of type `dyn for<'r> Fn(&'r isize) -> isize` cannot be known at compilation time
2 --> $DIR/issue-18919.rs:3:15
4 LL | fn ho_func(f: Option<FuncType>) {
5 | ^^^^^^^^^^^^^^^^ doesn't have a size known at compile-time
8 | - required by this bound in `Option`
10 = help: the trait `Sized` is not implemented for `dyn for<'r> Fn(&'r isize) -> isize`
11 help: you could relax the implicit `Sized` bound on `T` if it were used through indirection like `&T` or `Box<T>`
12 --> $DIR/issue-18919.rs:7:13
15 | ^ this could be changed to `T: ?Sized`...
17 | - ...if indirection were used here: `Box<T>`
19 error: aborting due to previous error
21 For more information about this error, try `rustc --explain E0277`.