re PR c++/84611 (ICE in operator[], at vec.h:826 (local_class_index()))

/cp
2018-04-19  Paolo Carlini  <paolo.carlini@oracle.com>

	PR c++/84611
	* pt.c (lookup_template_class_1): Check pushtag return value for
	error_mark_node.

/testsuite
2018-04-19  Paolo Carlini  <paolo.carlini@oracle.com>

	PR c++/84611
	* g++.dg/parse/crash68.C: New.

From-SVN: r259505

gcc/cp/ChangeLog

+2018-04-19  Paolo Carlini  <paolo.carlini@oracle.com>
+
+	PR c++/84611
+	* pt.c (lookup_template_class_1): Check pushtag return value for
+	error_mark_node.
+
 2018-04-19  Alexandre Oliva  <aoliva@redhat.com>
 
 	PR c++/80290

gcc/cp/pt.c

@@ -9444,7 +9444,9 @@ lookup_template_class_1 (tree d1, tree arglist, tree in_decl, tree context,
 
 	  /* A local class.  Make sure the decl gets registered properly.  */
 	  if (context == current_function_decl)
-	    pushtag (DECL_NAME (gen_tmpl), t, /*tag_scope=*/ts_current);
+	    if (pushtag (DECL_NAME (gen_tmpl), t, /*tag_scope=*/ts_current)
+		== error_mark_node)
+	      return error_mark_node;
 
 	  if (comp_template_args (CLASSTYPE_TI_ARGS (template_type), arglist))
 	    /* This instantiation is another name for the primary

gcc/testsuite/ChangeLog

+2018-04-19  Paolo Carlini  <paolo.carlini@oracle.com>
+
+	PR c++/84611
+	* g++.dg/parse/crash68.C: New.
+
 2018-04-19  H.J. Lu  <hongjiu.lu@intel.com>
 
 	PR libgcc/85334

gcc/testsuite/g++.dg/parse/crash68.C

+// PR c++/84611
+
+template<typename = int>
+struct a {
+  a() {
+    struct c;
+    try {
+    } catch (struct c {}) {  // { dg-error "types may not be defined|conflicting" }
+    }
+  }
+};
+
+struct d {
+  d();
+  a<> b;
+};
+
+d::d() {}