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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:13:1
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LL | / fn ho_func(f: Option<FuncType>) {
LL | | //~^ ERROR the size for values of type
LL | | }
| |_^ doesn't have a size known at compile-time
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= 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/second-edition/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`.
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