Not sure how you can say that. int a[4]; a[2]=2; a[6]=3; "Ignore the situation": emit the code the code for a[6]=3; in the same way you emitted the

Not sure how you can say that. int a[4]; a[2]=2; a[6]=3; "Ignore the situation": emit the code the code for a[6]=3; in the same way you emitted the code for a[2]=2. You've ignored the fact that this is UB. "Assume the situation cannot occur": don't know, but according to the UB extremists the compiler can now do anything it wants to do, including not emitting any code for this fragment at all (which appears to happen) or formatting your hard disk (which doesn't, last I checked). Assuming that a[6]=3 does not occur, despite the fact that it is written right there, would also allow putting a into registers, which "ignoring the situation" would not.