src/test/ui/issues/issue-18919.stderr

   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:3:15
   3    |
   4 LL | fn ho_func(f: Option<FuncType>) {
   5    |               ^^^^^^^^^^^^^^^^ doesn't have a size known at compile-time
   6 ...
   7 LL | enum Option<T> {
   8    |             - required by this bound in `Option`
   9    |
  10    = help: the trait `std::marker::Sized` is not implemented for `dyn for<'r> std::ops::Fn(&'r isize) -> isize`
  11    = note: to learn more, visit <https://doc.rust-lang.org/book/ch19-04-advanced-types.html#dynamically-sized-types-and-the-sized-trait>
  12
  13 error: aborting due to previous error
  14
  15 For more information about this error, try `rustc --explain E0277`.