PR c++/81060 - ICE with unexpanded parameter pack.

	* pt.c (check_for_bare_parameter_packs): Add loc parameter.
	* decl.c (grokdeclarator): Call it for qualifying_scope.

From-SVN: r261725

gcc/cp/ChangeLog

 2018-06-18  Jason Merrill  <jason@redhat.com>
 
+	PR c++/81060 - ICE with unexpanded parameter pack.
+	* pt.c (check_for_bare_parameter_packs): Add loc parameter.
+	* decl.c (grokdeclarator): Call it for qualifying_scope.
+
 	PR c++/86171 - ICE with recursive alias instantiation.
 	* pt.c (tsubst_decl): Handle recursive alias instantiation.
 

gcc/cp/cp-tree.h

@@ -6626,7 +6626,7 @@ extern bool template_parameter_pack_p           (const_tree);
 extern bool function_parameter_pack_p		(const_tree);
 extern bool function_parameter_expanded_from_pack_p (tree, tree);
 extern tree make_pack_expansion                 (tree, tsubst_flags_t = tf_warning_or_error);
-extern bool check_for_bare_parameter_packs      (tree);
+extern bool check_for_bare_parameter_packs      (tree, location_t = UNKNOWN_LOCATION);
 extern tree build_template_info			(tree, tree);
 extern tree get_template_info			(const_tree);
 extern vec<qualified_typedef_usage_t, va_gc> *get_types_needing_access_check (tree);

gcc/cp/decl.c

@@ -10175,6 +10175,9 @@ grokdeclarator (const cp_declarator *declarator,
 	      break;
 	    if (qualifying_scope)
 	      {
+		if (check_for_bare_parameter_packs (qualifying_scope,
+						    id_declarator->id_loc))
+		  return error_mark_node;
 		if (at_function_scope_p ())
 		  {
 		    /* [dcl.meaning] 

gcc/cp/pt.c

@@ -4031,7 +4031,7 @@ make_pack_expansion (tree arg, tsubst_flags_t complain)
    Returns TRUE and emits an error if there were bare parameter packs,
    returns FALSE otherwise.  */
 bool 
-check_for_bare_parameter_packs (tree t)
+check_for_bare_parameter_packs (tree t, location_t loc /* = UNKNOWN_LOCATION */)
 {
   tree parameter_packs = NULL_TREE;
   struct find_parameter_pack_data ppd;
@@ -4055,7 +4055,8 @@ check_for_bare_parameter_packs (tree t)
 
   if (parameter_packs) 
     {
-      location_t loc = EXPR_LOC_OR_LOC (t, input_location);
+      if (loc == UNKNOWN_LOCATION)
+	loc = EXPR_LOC_OR_LOC (t, input_location);
       error_at (loc, "parameter packs not expanded with %<...%>:");
       while (parameter_packs)
         {

gcc/testsuite/g++.dg/cpp0x/pr81060.C

@@ -7,5 +7,5 @@ template<typename... T> struct A
 };
 
 template<typename... T>
-const int A<T>::i // { dg-error "template definition of non-template" }
+const int A<T>::i // { dg-error "packs not expanded" }
 = []{ return 0; }(); // BOOM!

gcc/testsuite/g++.dg/cpp0x/variadic-ex2.C

 // { dg-do compile { target c++11 } }
-template<class... Types> struct B { // { dg-message "declaration of" }
+template<class... Types> struct B {
   void f3();
   void f4();
 };
 
 template<class... Types> void B<Types...>::f3() { } // OK
-template<class... Types> void B<Types>::f4() { } // { dg-error "invalid" }
+template<class... Types> void B<Types>::f4() { } // { dg-error "packs not expanded" }