https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86986
--- Comment #4 from Jason Merrill <jason at gcc dot gnu.org> --- Author: jason Date: Fri Apr 5 02:50:18 2019 New Revision: 270159 URL: https://gcc.gnu.org/viewcvs?rev=270159&root=gcc&view=rev Log: PR c++/86986 - ICE with TTP with parameter pack. Three separate issues were breaking this testcase. One, we were trying to look at the type of a template template parameter to see if it's a valid non-type template parameter. Two, we were treating a parameter pack named in the type of a template parameter pack of a TTP pack as being one of the packs expanded by the outer pack. Three, we weren't supplying all the necessary levels of template arguments when TTP matching. * pt.c (coerce_template_parameter_pack): Only look at the type of a non-type parameter pack. (fixed_parameter_pack_p_1): Don't recurse into the type of a non-type parameter pack. (coerce_template_template_parms): Call add_outermost_template_args. Added: trunk/gcc/testsuite/g++.dg/cpp0x/variadic-ttp9.C Modified: trunk/gcc/cp/ChangeLog trunk/gcc/cp/pt.c
