https://gcc.gnu.org/bugzilla/show_bug.cgi?id=122224
--- Comment #9 from Jonathan Wakely <redi at gcc dot gnu.org> --- (In reply to M Welinder from comment #0) > Bug 62039 is similar, but claimed fixed ages ago. FWIW that was indeed fixed, as you can see by compiling with -D_GLIBCXX_CONCEPT_CHECKS, which rejects the code at compile time. But those checks are unmaintained and not really compatible with C++11 or later.
