error[E0392]: parameter `'a` is never used --> $DIR/variance-regions-unused-direct.rs:15:18 | LL | struct Bivariant<'a>; //~ ERROR parameter `'a` is never used | ^^ unused type parameter | = help: consider removing `'a` or using a marker such as `std::marker::PhantomData` error[E0392]: parameter `'d` is never used --> $DIR/variance-regions-unused-direct.rs:17:19 | LL | struct Struct<'a, 'd> { //~ ERROR parameter `'d` is never used | ^^ unused type parameter | = help: consider removing `'d` or using a marker such as `std::marker::PhantomData` error: aborting due to 2 previous errors For more information about this error, try `rustc --explain E0392`.