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We were not comparing expression pack expansions correctly. We could consider distinct expansions equal and creating two, apparently equal, specializations that would sometimes collide. cp_tree_operand_length says a pack has 1 operand (for mangling), whereas it actually has 3, but only two of which are significant for equality. We must special case that in cp_tree_equal. That new code matches the hasher and the type_pack_expansion case in structural_comp_types. * tree.c (cp_tree_equal): [TEMPLATE_ID_EXPR, default] Refactor. [EXPR_PACK_EXPANSION]: Add.
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