PR c++/84376 - ICE with omitted template arguments.

	* pt.c (dguide_name_p): Check for IDENTIFIER_NODE.

From-SVN: r257706

gcc/cp/ChangeLog

 2018-02-15  Jason Merrill  <jason@redhat.com>
 
+	PR c++/84376 - ICE with omitted template arguments.
+	* pt.c (dguide_name_p): Check for IDENTIFIER_NODE.
+
 	PR c++/84368 - wrong error with local variable in variadic lambda.
 	* pt.c (tsubst_pack_expansion): Fix handling of non-packs in
 	local_specializations.

gcc/cp/pt.c

@@ -25454,7 +25454,8 @@ dguide_name (tree tmpl)
 bool
 dguide_name_p (tree name)
 {
-  return (TREE_TYPE (name)
+  return (TREE_CODE (name) == IDENTIFIER_NODE
+	  && TREE_TYPE (name)
 	  && !strncmp (IDENTIFIER_POINTER (name), dguide_base,
 		       strlen (dguide_base)));
 }

gcc/testsuite/g++.dg/cpp1z/class-deduction47.C

+// PR c++/84376
+
+template<int> struct A {};
+
+template<typename T> T foo() { return T(); }
+
+template<> A foo<A>();		// { dg-error "A" }