Foreign.C.Types in haskell2010

According to Haskell 2010, a marshallable foreign type has to be a newtype of a basic type with exposed constructor. Why constructors are not exposed in the module Foreign.C.Types from haskell2010? When I replace base with haskell2010 in

module Test where

import Foreign.C

foreign import ccall unsafe "sys/mount.h umount" umount :: CString -> IO CInt

I get

Unacceptable result type in foreign declaration: IO CInt
When checking declaration:
  foreign import ccall unsafe "static sys/mount.h umount" umount
    :: CString -> IO CInt

Trac metadata

Trac field	Value
Version	7.8.2
Type	Bug
TypeOfFailure	OtherFailure
Priority	normal
Resolution	Unresolved
Component	libraries/haskell2010
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