Improve various old tests.

tests/language/ref_before_declaration_test.dart

 // Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 // Test compile-time errors for illegal variable declarations if the name
 // has been referenced before the variable is declared.
 
 import 'dart:math' as math;
 
 use(value) => value;
@@ skipping 25 matching lines @@
     if (true) {
       use(x); // Refers to top-level x.
       use(y); // Refers to top-level y.
     }
     final x = "I have not yet begun to procrastinate."; // //# 02: compile-time error
     const y = "Honk if you like peace and quiet!"; // //# 03: compile-time error
   }
 
   void test4() {
     void Q() {
-      P(); // Refers to non-existing top-level function P
+      P(); //# 06: compile-time error
     }
-    void P() { // //# 06: compile-time error
-      Q(); //     //# 06: continued
-    } //          //# 06: continued
+    void P() {
+      Q();
+    }
 
     Function f = () {x = f;}; // //# 07: compile-time error
   }
 
   test() {
     test1();
     test2();
     test3();
     test4();
   }
@@ skipping 27 matching lines @@
   var int = 007;
 }
 
 void main() {
   var c = new C();
   c.test();
   testTypeRef();
   testLibPrefix();
   noErrorsExpected();
 }