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error: lifetime may not live long enough
--> $DIR/regions-variance-invariant-use-covariant.rs:17:12
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LL | fn use_<'b>(c: Invariant<'b>) {
| -- lifetime `'b` defined here
...
LL | let _: Invariant<'static> = c;
| ^^^^^^^^^^^^^^^^^^ type annotation requires that `'b` must outlive `'static`
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= 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 1 previous error
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