vlib/v/checker/tests/fn_type_exists.vv:1:34: error: unknown type `Pants`
    1 | type PantsCreator = fn (a Shirt) Pants
      |                                  ~~~~~
    2 |
    3 | type PantsConsumer = fn (p Pants)
vlib/v/checker/tests/fn_type_exists.vv:3:28: error: unknown type `Pants`
    1 | type PantsCreator = fn (a Shirt) Pants
    2 |
    3 | type PantsConsumer = fn (p Pants)
      |                            ~~~~~