boxResult ioOkDataCon result_ty `thenDs` \ (final_result_ty, res_wrapper) ->
let
- the_ccall_op = CCallOp (Just label) is_asm may_gc cCallConv
+ the_ccall_op = CCallOp (Left label) is_asm may_gc cCallConv
(map coreExprType final_args)
final_result_ty
in