error[E0277]: the trait bound `fn(Argument) -> Return {function}: Trait` is not satisfied
  --> $DIR/issue-99875.rs:12:11
   |
LL |     takes(function);
   |     ----- ^^^^^^^^ the trait `Trait` is not implemented for fn item `fn(Argument) -> Return {function}`
   |     |
   |     required by a bound introduced by this call
   |
note: required by a bound in `takes`
  --> $DIR/issue-99875.rs:9:18
   |
LL | fn takes(_: impl Trait) {}
   |                  ^^^^^ required by this bound in `takes`
help: the trait `Trait` is implemented for fn pointer `fn(Argument) -> Return`, try casting using `as`
   |
LL |     takes(function as fn(Argument) -> Return);
   |                    +++++++++++++++++++++++++

error[E0277]: the trait bound `[closure@$DIR/issue-99875.rs:14:11: 14:34]: Trait` is not satisfied
  --> $DIR/issue-99875.rs:14:11
   |
LL |     takes(|_: Argument| -> Return { todo!() });
   |     ----- ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the trait `Trait` is not implemented for closure `[closure@$DIR/issue-99875.rs:14:11: 14:34]`
   |     |
   |     required by a bound introduced by this call
   |
   = help: the trait `Trait` is implemented for fn pointer `fn(Argument) -> Return`
note: required by a bound in `takes`
  --> $DIR/issue-99875.rs:9:18
   |
LL | fn takes(_: impl Trait) {}
   |                  ^^^^^ required by this bound in `takes`

error: aborting due to 2 previous errors

For more information about this error, try `rustc --explain E0277`.