[Bug c++/59873] The value of char32_t U'\u0000' and char16_t u'\u000' is 1, instead of 0.

[schwab@linux-m68k.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59873

--- Comment #6 from Andreas Schwab <schwab@linux-m68k.org> ---
\u0000 is only malformed outside of string and char literals, eg. in
identifiers.