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In extract_autos_r, we need to recompute TYPE_CANONICAL for the template type parameter after adjusting its index, otherwise we end up with a comptypes ICE for the below testcase. Note that such in-place type adjustment isn't generally safe to do since the type could be the TYPE_CANONICAL of another (unadjusted) type, but in this case the canonical auto (of some level and 0 index) is the first auto (of that level) that's created, and so any auto that we do end up adjusting can't be the canonical one. PR c++/101886 gcc/cp/ChangeLog: * pt.cc (extract_autos_r): Recompute TYPE_CANONICAL after adjusting the template type parameter's index. Simplify by using TEMPLATE_TYPE_IDX. Add some sanity checks. gcc/testsuite/ChangeLog: * g++.dg/concepts/auto5.C: New test.
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