error[E0308]: mismatched types
  --> $DIR/regions-variance-invariant-use-covariant.rs:17:33
   |
LL |     let _: Invariant<'static> = c;
   |                                 ^ lifetime mismatch
   |
   = note: expected type `Invariant<'static>`
              found type `Invariant<'b>`
note: the lifetime 'b as defined on the function body at 11:9...
  --> $DIR/regions-variance-invariant-use-covariant.rs:11:9
   |
LL | fn use_<'b>(c: Invariant<'b>) {
   |         ^^
   = note: ...does not necessarily outlive the static lifetime

error: aborting due to previous error

For more information about this error, try `rustc --explain E0308`.