-tcCheckFIType sig_ty _ _ idecl@(CImport _ _ _ _ (CLabel _)) = do
- checkCg checkCOrAsm
- check (isFFILabelTy sig_ty) (illegalForeignTyErr empty sig_ty)
- return idecl
+tcCheckFIType sig_ty arg_tys res_ty idecl@(CImport _ _ _ _ (CLabel _))
+ = ASSERT( null arg_tys )
+ do { checkCg checkCOrAsm
+ ; check (isFFILabelTy res_ty) (illegalForeignTyErr empty sig_ty)
+ ; return idecl } -- NB check res_ty not sig_ty!
+ -- In case sig_ty is (forall a. ForeignPtr a)