error[E0277]: can't compare `fn()` with `_` in const contexts
  --> $DIR/cmp_fn_pointers.rs:2:16
   |
LL |     unsafe { x == y }
   |                ^^ no implementation for `fn() == _`
   |
   = help: the trait `~const PartialEq<_>` is not implemented for `fn()`
note: the trait `PartialEq<_>` is implemented for `fn()`, but that implementation is not `const`
  --> $DIR/cmp_fn_pointers.rs:2:16
   |
LL |     unsafe { x == y }
   |                ^^

error: aborting due to previous error

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