https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86301
--- Comment #3 from Jonathan Wakely <redi at gcc dot gnu.org> --- (In reply to zhonghao from comment #2) > (In reply to Jonathan Wakely from comment #1) > > (In reply to zhonghao from comment #0) > > > A previous version of clang++ produces similar error message for this > > > code, > > > but was fixed. > > > > No it didn't, the error shown in the Clang bug comes from GCC! > > > > Please make more effort to understand what you are doing, OR I WILL BAN YOUR > > ACCOUNT. > > Did you try the latest g++ and clang++. Yes. > They produce different results when > they compile the code. My clang is 7.0.0. It does not produce any error > messages for this code. That doesn't mean the code is valid. > Do the difference indicate bugs in g++? No. See https://gcc.gnu.org/gcc-7/porting_to.html#hypothetical-instantiation
