https://gcc.gnu.org/bugzilla/show_bug.cgi?id=88395
Jonathan Wakely <redi at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Status|UNCONFIRMED |NEW Last reconfirmed| |2018-12-13 Ever confirmed|0 |1 --- Comment #4 from Jonathan Wakely <redi at gcc dot gnu.org> --- (In reply to Nicholas Krause from comment #3) > Is what I am getting because I don't have the class definition. I would like > all of the code so that it builds properly and can check against a compiling > working program. No, it's what you're getting because you didn't use the -fconcepts flag which is necessary to enable the language feature. The example is fine, it's not missing anything, so I'm confirming the bug.