error[E0369]: binary operation `==` cannot be applied to type `for<'a> fn(&'a i32) -> &'a i32 {foo}`
  --> $DIR/issue-77910-2.rs:7:12
   |
LL |     if foo == y {}
   |        --- ^^ - _
   |        |
   |        for<'a> fn(&'a i32) -> &'a i32 {foo}
   |
help: use parentheses to call this function
   |
LL |     if foo(/* &i32 */) == y {}
   |           ++++++++++++

error: aborting due to 1 previous error

For more information about this error, try `rustc --explain E0369`.