error[E0308]: mismatched types
  --> $DIR/hr-subtype.rs:39:26
   |
LL |               gimme::<$t1>(None::<$t2>);
   |                            ^^^^^^^^^^^ lifetime mismatch
...
LL | / check! { free_x_vs_free_y: (fn(&'x u32),
LL | |                             fn(&'y u32)) }
   | |__________________________________________- in this macro invocation
   |
   = note: expected type `std::option::Option<fn(&'x u32)>`
              found type `std::option::Option<fn(&'y u32)>`
note: the lifetime 'x as defined on the function body at 38:22...
  --> $DIR/hr-subtype.rs:38:22
   |
LL |           fn supertype<'x,'y:'x,'z:'y>() {
   |                        ^^
...
LL | / check! { free_x_vs_free_y: (fn(&'x u32),
LL | |                             fn(&'y u32)) }
   | |__________________________________________- in this macro invocation
note: ...does not necessarily outlive the lifetime 'y as defined on the function body at 38:25
  --> $DIR/hr-subtype.rs:38:25
   |
LL |           fn supertype<'x,'y:'x,'z:'y>() {
   |                           ^^
...
LL | / check! { free_x_vs_free_y: (fn(&'x u32),
LL | |                             fn(&'y u32)) }
   | |__________________________________________- in this macro invocation

error: aborting due to previous error

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