error[E0392]: lifetime parameter `'a` is never used --> $DIR/variance-regions-unused-direct.rs:5:18 | LL | struct Bivariant<'a>; | ^^ unused lifetime parameter | = help: consider removing `'a`, referring to it in a field, or using a marker such as `PhantomData` error[E0392]: lifetime parameter `'d` is never used --> $DIR/variance-regions-unused-direct.rs:7:19 | LL | struct Struct<'a, 'd> { | ^^ unused lifetime parameter | = help: consider removing `'d`, referring to it in a field, or using a marker such as `PhantomData` error: aborting due to 2 previous errors For more information about this error, try `rustc --explain E0392`.