T14059b.hs:23:1: warning: [-Wincomplete-patterns (in -Wextra)]
    Pattern match(es) are non-exhaustive
    In an equation for ‘wibble’:
        Patterns not matched: p where p is not one of {STrue}

T14059b.hs:26:1: warning: [-Wincomplete-patterns (in -Wextra)]
    Pattern match(es) are non-exhaustive
    In an equation for ‘wobble’:
        Patterns not matched: p where p is not one of {STooGoodToBeTrue}