These variants of the above functions are for use with C libraries that encode Unicode using the C wchar_t type in a system-dependent way. The only encodings supported are • UTF-32 (the C compiler defines CSize instance Storable CSize instance Bits CSize data CWchar Haskell type representing the C wchar_t type. 240 CHAPTER 28. FOREIGN.C.TYPES instance Bounded CWchar instance Enum CWchar instance Eq