[Bug c++/68288] New: botched floating-point UDL

[lucdanton at free dot fr]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68288

            Bug ID: 68288
           Summary: botched floating-point UDL
           Product: gcc
           Version: 6.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: lucdanton at free dot fr
  Target Milestone: ---

I'm seeing this behaviour with GCC 6, GCC 5.2.0 and GCC 4.9.2.

$ g++-trunk --version
g++-trunk (GCC) 6.0.0 20151103 (experimental)
Copyright (C) 2015 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

$ cat main.cpp
long double operator""_a(long double) { return {}; }
long double operator""_e(long double) { return {}; }

int main()
{
    // all fine
    void(0e1_a+0);
    void(0e1_e*0);
    void(0e1_e +0);
    // error: unable to find numeric literal operator 'operator""e+0'
    void(0e1_e+0);
}
$ g++-trunk -std=c++11 main.cpp
main.cpp: In function 'int main()':
main.cpp:10:10: error: unable to find numeric literal operator 'operator""_e+0'
     void(0e1_e+0);
          ^
main.cpp:10:10: note: use -std=gnu++11 or -fext-numeric-literals to enable more
built-in suffixes