https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100198
--- Comment #2 from 康桓瑋 <hewillk at gmail dot com> --- (In reply to Richard Biener from comment #1) > would be nice if you'd hinted on whether you think your testcases are valid > C++ or not. guessing invalid here Oops, I should do that, this is a valid code. https://godbolt.org/z/Kx67MP85f