EmptyCase006.hs:18:7: warning: [GHC-62161] [-Wincomplete-patterns (in -Wextra)]
    Pattern match(es) are non-exhaustive
    In a \case alternative:
        Patterns of type ‘Foo1 Int’ not matched: Foo1 MkGA1

EmptyCase006.hs:26:7: warning: [GHC-62161] [-Wincomplete-patterns (in -Wextra)]
    Pattern match(es) are non-exhaustive
    In a \case alternative:
        Patterns of type ‘Foo1 a’ not matched:
            Foo1 MkGA1
            Foo1 (MkGA2 _)
            Foo1 MkGA3