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Here find_parameter_packs_r isn't detecting the pack T inside the requires-expr's parameter list ultimately because cp_walk_trees deliberately avoids walking the list so as to avoid false positives in the unexpanded pack checker. But it should still be fine to walk the TREE_TYPE of each parameter, which we already need to do from for_each_template_parm_r, and is sufficient to fix the testcase. PR c++/107417 gcc/cp/ChangeLog: * pt.cc (for_each_template_parm_r) <case REQUIRES_EXPR>: Move walking of the TREE_TYPE of each parameter to ... * tree.cc (cp_walk_subtrees) <case REQUIRES_EXPR>: ... here. gcc/testsuite/ChangeLog: * g++.dg/cpp2a/concepts-requires33.C: New test.
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