error[E0392]: lifetime parameter `'a` is never used
  --> $DIR/variance-unused-region-param.rs:3:19
   |
LL | struct SomeStruct<'a> { x: u32 }
   |                   ^^ unused lifetime parameter
   |
   = help: consider removing `'a`, referring to it in a field, or using a marker such as `PhantomData`

error[E0392]: lifetime parameter `'a` is never used
  --> $DIR/variance-unused-region-param.rs:4:15
   |
LL | enum SomeEnum<'a> { Nothing }
   |               ^^ unused lifetime parameter
   |
   = help: consider removing `'a`, referring to it in a field, or using a marker such as `PhantomData`

error: aborting due to 2 previous errors

For more information about this error, try `rustc --explain E0392`.