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While instantiating test(Plot) we partially instantiate the generic lambda. We look at forward<T>(rest)... and see that it's just replacing parameter packs with new parameter packs and tries to do a direct substitution. But because register_parameter_specializations had built up a NONTYPE_ARGUMENT_PACK around the new parameter pack, the substitution failed. So let's not wrap it that way. gcc/cp/ChangeLog 2020-04-22 Jason Merrill <jason@redhat.com> PR c++/94546 * pt.c (register_parameter_specializations): If the instantiation is still a parameter pack, don't wrap it in a NONTYPE_ARGUMENT_PACK. (tsubst_pack_expansion, tsubst_expr): Adjust.
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