error[E0308]: mismatched types
  --> $DIR/old-lub-glb-hr-noteq1.rs:17:14
   |
LL |         _ => y,
   |              ^ one type is more general than the other
   |
   = note: expected fn pointer `for<'a, 'b> fn(&'a u8, &'b u8) -> &'a u8`
              found fn pointer `for<'a> fn(&'a u8, &'a u8) -> &'a u8`

error: aborting due to 1 previous error

For more information about this error, try `rustc --explain E0308`.