| error[E0277]: the size for values of type `dyn for<'r> std::ops::Fn(&'r isize) -> isize` cannot be known at compilation time |
| --> $DIR/issue-18919.rs:3:15 |
| | |
| LL | fn ho_func(f: Option<FuncType>) { |
| | ^^^^^^^^^^^^^^^^ doesn't have a size known at compile-time |
| | |
| = help: the trait `std::marker::Sized` is not implemented for `dyn for<'r> std::ops::Fn(&'r isize) -> isize` |
| = note: to learn more, visit <https://doc.rust-lang.org/book/ch19-04-advanced-types.html#dynamically-sized-types-and-the-sized-trait> |
| = note: required by `std::option::Option` |
| |
| error: aborting due to previous error |
| |
| For more information about this error, try `rustc --explain E0277`. |
