haskell - 警告 : newtype `CInt' is used in an FFI declaration,

Question

使用 ghc 7.4.2 构建 gtk2hs-buildtools 时，我收到以下警告:

c2hs/toplevel/C2HSConfig.hs:110:1:
    Warning: newtype `CInt' is used in an FFI declaration,
             but its constructor is not in scope.
             This will become an error in GHC 7.6.1.
    When checking declaration:
      foreign import ccall safe "static bitfield_direction" bitfield_direction
        :: CInt

即使我有导入Foreign.C.Types(CInt)，我也会在 FFI 调用中收到类似的警告。

消除此警告的正确方法是什么？

Answer 1

import Foreign.C.Types(CInt(..))

获取构造函数。