T15450.hs:6:7: warning: [GHC-62161] [-Wincomplete-patterns (in -Wextra)]
    Pattern match(es) are non-exhaustive
    In a case alternative:
        Patterns of type ‘Bool’ not matched:
            False
            True

T15450.hs:9:7: warning: [GHC-62161] [-Wincomplete-patterns (in -Wextra)]
    Pattern match(es) are non-exhaustive
    In a case alternative: Patterns of type ‘Bool’ not matched: False