error[E0308]: mismatched types --> $DIR/old-lub-glb-object.rs:9:14 | LL | _ => y, | ^ one type is more general than the other | = note: expected trait object `dyn for<'a, 'b> Foo<&'a u8, &'b u8>` found trait object `dyn for<'a> Foo<&'a u8, &'a u8>` error[E0308]: mismatched types --> $DIR/old-lub-glb-object.rs:9:14 | LL | _ => y, | ^ one type is more general than the other | = note: expected trait object `dyn for<'a, 'b> Foo<&'a u8, &'b u8>` found trait object `dyn for<'a> Foo<&'a u8, &'a u8>` = note: duplicate diagnostic emitted due to `-Z deduplicate-diagnostics=no` error: aborting due to 2 previous errors For more information about this error, try `rustc --explain E0308`.