error[E0599]: no function or associated item named `make_g` found for type `for<'r> fn(&'r ())` in the current scope
  --> $DIR/issue-57362-2.rs:22:25
   |
LL |     let x = <fn (&())>::make_g();
   |                         ^^^^^^ function or associated item not found in `for<'r> fn(&'r ())`
   |
   = help: items from traits can only be used if the trait is implemented and in scope
   = note: the following trait defines an item `make_g`, perhaps you need to implement it:
           candidate #1: `X`

error: aborting due to previous error

For more information about this error, try `rustc --explain E0599`.