vlib/v/checker/tests/fn_type_exists.vv:1:1: error: type `Pants` doesn't exist
    1 | type PantsCreator = fn (a Shirt) Pants
      | ~~~~~~~~~~~~~~~~~
    2 |
    3 | type PantsConsumer = fn (p Pants)
vlib/v/checker/tests/fn_type_exists.vv:3:1: error: type `Pants` doesn't exist
    1 | type PantsCreator = fn (a Shirt) Pants
    2 |
    3 | type PantsConsumer = fn (p Pants)
      | ~~~~~~~~~~~~~~~~~~
    4 |
    5 | fn main() {
