#define RET_INFO_PTR_TO_STRUCT(info) ((StgRetInfoTable *)(info) - 1)
#define FUN_INFO_PTR_TO_STRUCT(info) ((StgFunInfoTable *)(info) - 1)
#define THUNK_INFO_PTR_TO_STRUCT(info) ((StgThunkInfoTable *)(info) - 1)
#define RET_INFO_PTR_TO_STRUCT(info) ((StgRetInfoTable *)(info) - 1)
#define FUN_INFO_PTR_TO_STRUCT(info) ((StgFunInfoTable *)(info) - 1)
#define THUNK_INFO_PTR_TO_STRUCT(info) ((StgThunkInfoTable *)(info) - 1)