error[E0496]: lifetime name `'a` shadows a lifetime name that is already in scope
  --> $DIR/captured-invalid-lifetime.rs:15:13
   |
LL | impl<'a> Foo<'a> {
   |      -- first declared here
LL |     fn pass<'a>() -> impl Sized {}
   |             ^^ lifetime `'a` already in scope

error: aborting due to 1 previous error

For more information about this error, try `rustc --explain E0496`.