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This is a crash on invalid [:X:]<args> where [:X:] doesn't designate a template. Like in cp_parser_template_id, we should check that we have an appropriate template before calling finish_template_type on it. PR c++/124493 gcc/cp/ChangeLog: * pt.cc (tsubst) <case TEMPLATE_ID_EXPR>: Check that templ is either DECL_TYPE_TEMPLATE_P or DECL_TEMPLATE_TEMPLATE_PARM_P. gcc/testsuite/ChangeLog: * g++.dg/reflect/crash19.C: New test. * g++.dg/reflect/crash22.C: New test. Reviewed-by: Jason Merrill <jason@redhat.com>
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