Comment by saagarjha

Well…the answer is that the response you get will depend. If you are familiar with the standard and how it is implemented in compilers, you will get a sense for which UBs are implicitly blessed by compilers and you can file bugs against. "I double freed a pointer and expected something reasonable to happen" is never going to get you a serious response. But if you ask something like "I tagged this pointer's bit pattern and untagged it and the pointer I got back isn't valid" you will generally be heard out. FWIW I would recommend picking a different language to write your language runtime in 2022, using it to support your new language is often a good way to invite memory unsafety bugs in your code.