[Bug preprocessor/94168] [10 Regression] error: extended character § is not valid in an identifier since r10-3309-g7d112d6670a0e0e6

[joseph at codesourcery dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94168

--- Comment #3 from joseph at codesourcery dot com <joseph at codesourcery dot com> ---
The reasoning for rejecting this (for UCNs in both C and C++, for other 
characters in C++ because of the C++ rule that such characters get 
converted to UCNs) is that the constraints on permitted characters in 
identifiers appear to me to apply to any pp-token that matches the syntax 
productions for "identifier", whether or not that pp-token ends up getting 
converted to a token.  This is similar to

#if 0
"multiline
string"
#endif

being disallowed as well.