UB due to unreachable branches

[jumpnbrownweasel]

Thanks for taking a look!

[trentj]

@tczajka

I don't think it's contradictory. The first example has reachable UB that will actually happen 50% of the time.

That's fair; I was wrong to call the question ill-formed. From the compiler's perspective, UB is what "can never happen" but of course something does happen in actual execution when a program has UB.