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This patch teaches cp_walk_subtrees to visit the template represented by a CTAD placeholder, which would otherwise be not visited during find_template_parameters. The template may be a template template parameter (as in the first testcase), or it may implicitly use the template parameters of an enclosing class template (as in the second testcase), and in either case we need to visit this tree to record the template parameters used therein for later satisfaction. gcc/cp/ChangeLog: PR c++/98611 * tree.c (cp_walk_subtrees) <case TEMPLATE_TYPE_PARM>: Visit the template of a CTAD placeholder. gcc/testsuite/ChangeLog: PR c++/98611 * g++.dg/cpp2a/concepts-ctad1.C: New test. * g++.dg/cpp2a/concepts-ctad2.C: New test. |
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