https://gcc.gnu.org/bugzilla/show_bug.cgi?id=106821 Bug 106821 depends on bug 106221, which changed state.
Bug 106221 Summary: lamba inside a decltype in a using statement does not always work https://gcc.gnu.org/bugzilla/show_bug.cgi?id=106221 What |Removed |Added ---------------------------------------------------------------------------- Status|NEW |RESOLVED Resolution|--- |FIXED