Fix language tests wrt. warnings.

tests/language/abstract_runtime_error_test.dart

Index: tests/language/abstract_runtime_error_test.dart
diff --git a/tests/language/abstract_runtime_error_test.dart b/tests/language/abstract_runtime_error_test.dart
index c408ec8b93e86c4e9e1f5c29c8445a349d8549b5..eb6a0ead724e90b8f50718c43f62e238fc706610 100644
--- a/tests/language/abstract_runtime_error_test.dart
+++ b/tests/language/abstract_runtime_error_test.dart
@@ -12,7 +12,7 @@ import "package:expect/expect.dart";
 
 
 abstract class Interface {
-  void foo();
+  void foo(); /// 03: static type warning
 }
 
 abstract class AbstractClass {
@@ -27,19 +27,19 @@ class NonAbstractClass implements Interface {
   toString() => 'NonAbstractClass';
 }
 
-Interface interface() => new Interface();
+Interface interface() => new Interface(); /// 01: static type warning
 
-AbstractClass abstractClass() => new AbstractClass();
+AbstractClass abstractClass() => new AbstractClass(); /// 02: static type warning
 
 bool isAbstractClassInstantiationError(e) {
   return e is AbstractClassInstantiationError;
 }
 
 void main() {
-  Expect.throws(interface, isAbstractClassInstantiationError,
-                "expected AbstractClassInstantiationError");
-  Expect.throws(abstractClass, isAbstractClassInstantiationError,
-                "expected AbstractClassInstantiationError");
+  Expect.throws(interface, isAbstractClassInstantiationError, /// 01: continued
+                "expected AbstractClassInstantiationError");  /// 01: continued
+  Expect.throws(abstractClass, isAbstractClassInstantiationError, /// 02: continued
+                "expected AbstractClassInstantiationError");      /// 02: continued
   Expect.stringEquals('ConcreteSubclass', '${new ConcreteSubclass()}');
   Expect.stringEquals('NonAbstractClass', '${new NonAbstractClass()}');
 }