foreign types: • Char, Int, Double, Float, and Bool as exported by the Haskell Prelude as well as • Int8, Int16, Int32, Int64, Word8, Word16, Word32, Word64, Ptr a, FunPtr a, and StablePtr a, for any type Constraint on concrete C type HsChar Char integral type HsInt Int signed integral type, ≥ 30 bit HsInt8 Int8 signed integral type, 8 bit; int8_t if available HsInt16 Int16 signed integral type, 16 bit; int16_t Char HS_INT_MIN minBound :: Int HS_INT_MAX maxBound :: Int HS_INT8_MIN minBound :: Int8 HS_INT8_MAX maxBound :: Int8 HS_INT16_MIN minBound :: Int16 HS_INT16_MAX maxBound :: Int16 HS_INT32_MIN minBound