error: lifetime may not live long enough --> $DIR/regions-variance-covariant-use-contravariant.rs:23:12 | LL | fn use_<'short,'long>(c: Covariant<'long>, | ------ ----- lifetime `'long` defined here | | | lifetime `'short` defined here ... LL | let _: Covariant<'short> = c; | ^^^^^^^^^^^^^^^^^ type annotation requires that `'short` must outlive `'long` | = help: consider adding the following bound: `'short: 'long` error: aborting due to 1 previous error