Is there a way to trap messages sent to nil in Objective-C?

Question

I\'ve just been bitten by an annoying bug that was made obscure by the \"send message to nil is ok\" behaviour in Objective-C.

I\'ve seen Sending a message to nil?, and

Answer 1

You could use a ObjC undocumented trick or dtrace (see the comments for the dtrace solution).

pid$1::objc_msgSend:entry
/arg0==0/
{
  ustack();
}