https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81279
--- Comment #1 from Jason Vas Dias <jason.vas.dias at gmail dot com> --- Obviously, G++ 5.4.0 and 6.3.0 are able to expand the text '_HeadList...' here into the list of types: Line 184: _t._call< _HeadList... But G++ 7.1.0 is not able to do so, and gives no clue as to why not. I guess I must consider variadic template arguments simply "broken" in this release of GCC ?
