On Friday, 23 October 2015 at 12:17:22 UTC, Walter Bright wrote:
I think that ship has sailed. Illegal values in a dchar are not UB. Making it UB would result in surprising behavior which you've noted. Also, this segues into what to do about string, wstring, and dstring with invalid sequences in them. Currently, functions defined what they do with invalid sequences. Making it UB would be a burden to programmers.
That makes sense to me. I think the language would have to work a lot harder to block the creation of invalid dchar values to justify the current VRP assumption.
Fixing the compiler in accordance with option #2 looks like it should be easy, so far.
