1error[E0308]: mismatched types 2 --> $DIR/hr-subtype.rs:45:13 3 | 4LL | gimme::<$t1>(None::<$t2>); 5 | ^^^^^^^^^^^^^^^^^^^^^^^^^ one type is more general than the other 6... 7LL | / check! { bound_a_vs_free_x: (for<'a> fn(&'a u32), 8LL | | fn(&'x u32)) } 9 | |______________- in this macro invocation 10 | 11 = note: expected enum `Option<for<'a> fn(&'a u32)>` 12 found enum `Option<fn(&u32)>` 13 = note: this error originates in the macro `check` (in Nightly builds, run with -Z macro-backtrace for more info) 14 15error: aborting due to previous error 16 17For more information about this error, try `rustc --explain E0308`. 18