Improve various old tests.

tests/language/ref_before_declaration_test.dart

Index: tests/language/ref_before_declaration_test.dart
diff --git a/tests/language/ref_before_declaration_test.dart b/tests/language/ref_before_declaration_test.dart
index 3eb718c80b8312fbca8de07e1530160a3cf5f40e..a8faf054421475bf3995aa1b9c64489414f4ad35 100644
--- a/tests/language/ref_before_declaration_test.dart
+++ b/tests/language/ref_before_declaration_test.dart
@@ -43,11 +43,11 @@ class C {
 
   void test4() {
     void Q() {
-      P(); // Refers to non-existing top-level function P
+      P(); //# 06: compile-time error
+    }
+    void P() {
+      Q();
     }
-    void P() { // //# 06: compile-time error
-      Q(); //     //# 06: continued
-    } //          //# 06: continued
 
     Function f = () {x = f;}; // //# 07: compile-time error
   }