error: lifetime may not live long enough --> $DIR/regions-variance-invariant-use-contravariant.rs:20:12 | LL | fn use_<'short,'long>(c: Invariant<'long>, | ------ ----- lifetime `'long` defined here | | | lifetime `'short` defined here ... LL | let _: Invariant<'short> = c; | ^^^^^^^^^^^^^^^^^ type annotation requires that `'short` must outlive `'long` | = help: consider adding the following bound: `'short: 'long` = note: requirement occurs because of the type `Invariant<'_>`, which makes the generic argument `'_` invariant = note: the struct `Invariant<'a>` is invariant over the parameter `'a` = help: see for more information about variance error: aborting due to 1 previous error