tbaeder added a comment.

One thing I'm wondering though is:

  constexpr char A[] = {'1', '2', '3'};
  constexpr double d = __builtin_nans(A);

what's expected here? The given char array is not null-terminated. 
Should the interpreter ignore the null byte at the end if it's there? 
`StringRef::getAsInteger()` always returns an error if it encounters one, so 
the currentcode in `InterpBuiltin.cpp` ignores the last byte and will pass `12` 
along for the example above.


CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D155356/new/

https://reviews.llvm.org/D155356

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