https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68071
TC <rs2740 at gmail dot com> changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |rs2740 at gmail dot com --- Comment #1 from TC <rs2740 at gmail dot com> --- auto l = [](auto&& x, auto&&...y) { return x; }; l(1); compiles in GCC. This looks like a parsing issue - the ... is being parsed as C-style varargs instead of a pack.