Improve diagnostic for forgotten ().

* parser.c (cp_parser_postfix_dot_deref_expression): Use
	complete_type_or_else for unknown_type_node, too.

From-SVN: r236220

gcc/cp/ChangeLog

@@ -1,3 +1,8 @@
+2016-05-13  Jason Merrill  <jason@redhat.com>
+
+	* parser.c (cp_parser_postfix_dot_deref_expression): Use
+	complete_type_or_else for unknown_type_node, too.
+
 2016-05-12  Marek Polacek  <polacek@redhat.com>
 
 	PR c/70756

gcc/cp/parser.c

@@ -7207,18 +7207,12 @@ cp_parser_postfix_dot_deref_expression (cp_parser *parser,
 	 underlying type here.  */
       scope = non_reference (scope);
       /* The type of the POSTFIX_EXPRESSION must be complete.  */
-      if (scope == unknown_type_node)
-	{
-	  error_at (location, "%qE does not have class type",
-		    postfix_expression.get_value ());
-	  scope = NULL_TREE;
-	}
       /* Unlike the object expression in other contexts, *this is not
 	 required to be of complete type for purposes of class member
 	 access (5.2.5) outside the member function body.  */
-      else if (postfix_expression != current_class_ref
-	       && !(processing_template_decl && scope == current_class_type))
-	scope = complete_type_or_else (scope, NULL_TREE);
+      if (postfix_expression != current_class_ref
+	  && !(processing_template_decl && scope == current_class_type))
+	scope = complete_type_or_else (scope, postfix_expression);
       /* Let the name lookup machinery know that we are processing a
 	 class member access expression.  */
       parser->context->object_type = scope;

gcc/testsuite/g++.dg/gomp/udr-4.C

@@ -1,7 +1,7 @@
 // { dg-do compile }
 
 struct S;					// { dg-message "forward declaration" }
-#pragma omp declare reduction (+:S:omp_out.s += omp_in.s) // { dg-error "invalid use of incomplete type" }
+#pragma omp declare reduction (+:S:omp_out.s += omp_in.s) // { dg-error "incomplete type" }
 struct S { int s; S () : s (1) {} };
 #pragma omp declare reduction (*:S:omp_out.s *= omp_in.s)
 

gcc/testsuite/g++.dg/parse/dot1.C

@@ -1,4 +1,4 @@
 // PR c++/24560
 
 struct A { void f(); };
-void g() { A().f.a; } // { dg-error "class" }
+void g() { A().f.a; } // { dg-error "invalid use of member function" }

gcc/testsuite/g++.dg/template/pseudodtor3.C

@@ -5,7 +5,7 @@ struct A
 {
   typedef int T;
   T &foo ();
-  A () { foo.~T (); }	// { dg-error "10:does not have class type|expected" }
+  A () { foo.~T (); }	// { dg-error "10:invalid use of member function|expected" }
 };
 
 template <typename T> struct B