[Bug c++/61038] g++ -E is unusable with UDL strings

[3dw4rd at verizon dot net]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61038

--- Comment #7 from Ed Smith-Rowland <3dw4rd at verizon dot net> ---
Note to self: you DO need to take care of char...

void
operator "" _t(const char)
{
}

#define QUOTE(s) #s

int
main()
{
    QUOTE('"'_t);
    QUOTE('\''_t);
    QUOTE('\\'_t);
}