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error: lifetime may not live long enough
--> $DIR/regions-variance-invariant-use-contravariant.rs:20:12
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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 <https://doc.rust-lang.org/nomicon/subtyping.html> for more information about variance
error: aborting due to previous error
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