void IoState_show(IoState *self);

IoObject *IoState_replacePerformFunc_with_(IoState *self, 
								   TagPerformFunc *oldFunc, 
								   TagPerformFunc *newFunc);

void IoState_debuggingOn(IoState *self);
void IoState_debuggingOff(IoState *self);

int IoState_hasDebuggingCoroutine(IoState *self);

void IoState_updateDebuggingMode(IoState *self);