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I still haven't figured out how to correctly mangle the case in pack-indexing9.C where write_type is called with PACK_INDEX_TYPE where PACK_INDEX_PACK is TREE_VEC of types, i.e. already expanded pack, but given that right now we sorry on mangling of all PACK_INDEX_TYPE or PACK_INDEX_EXPR trees, I think the following patch is an incremental progress in the right direction and just mangles what is clearly specified in the proposal. This patch relies on the PR124198 patch I've just posted, because the casts to size_t change mangling of pack...[1] from having i1 in it to m1 (on x86_64, j1 on ia32, ...). 2026-04-04 Jakub Jelinek <jakub@redhat.com> PR c++/124487 * mangle.cc (write_type) <case PACK_INDEX_TYPE>: Handle pack index mangling unless (for now) PACK_INDEX_PACK is a TREE_VEC. (write_expression): Handle PACK_INDEX_EXPR. * g++.dg/cpp26/pack-indexing7.C: Don't xfail dg-bogus. * g++.dg/cpp26/pack-indexing22.C: New test.
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