#error BaseReg must be in a register for THREADED_RTS
#endif
#define BaseReg (&((struct PartCapability_ *)MainCapability)->r)
-#define ASSIGN_BaseReg(e) /*nothing*/
+#define ASSIGN_BaseReg(e) (e)
#endif
#if defined(REG_Sp) && !defined(NO_GLOBAL_REG_DECLS)