1 error[E0277]: the size for values of type `dyn for<'r> std::ops::Fn(&'r isize) -> isize` cannot be known at compilation time
2 --> $DIR/issue-18919.rs:13:1
4 LL | / fn ho_func(f: Option<FuncType>) {
5 LL | | //~^ ERROR the size for values of type
7 | |_^ doesn't have a size known at compile-time
9 = help: the trait `std::marker::Sized` is not implemented for `dyn for<'r> std::ops::Fn(&'r isize) -> isize`
10 = note: to learn more, visit <https://doc.rust-lang.org/book/second-edition/ch19-04-advanced-types.html#dynamically-sized-types-and-the-sized-trait>
11 = note: required by `std::option::Option`
13 error: aborting due to previous error
15 For more information about this error, try `rustc --explain E0277`.