error[E0308]: mismatched types
  --> $DIR/hr-subtype.rs:39:26
   |
LL |               gimme::<$t1>(None::<$t2>);
   |                            ^^^^^^^^^^^ expected concrete lifetime, found bound lifetime parameter 'a
...
LL | / check! { bound_contra_a_contra_b_ret_co_a: (for<'a,'b> fn(Contra<'a>, Contra<'b>) -> Co<'a>,
LL | |                                             for<'a>    fn(Contra<'a>, Contra<'a>) -> Co<'a>) }
   | |______________________________________________________________________________________________- in this macro invocation
   |
   = note: expected type `std::option::Option<for<'a, 'b> fn(Contra<'a>, Contra<'b>) -> Co<'a>>`
              found type `std::option::Option<for<'a> fn(Contra<'a>, Contra<'a>) -> Co<'a>>`

error: aborting due to previous error

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