anchor.diff:  class ClassTypeAliasTest extends ParserTestCase {
     void test_isAbstract() {
       expect(
  -        AstTestFactory
  -            .classTypeAlias("A", null, null, null, null, null)
  +        AstTestFactory.classTypeAlias("A", null, null, null, null, null)
               .isAbstract,
           isFalse);
       expect(
  -        AstTestFactory
  -            .classTypeAlias("B", null, Keyword.ABSTRACT, null, null, null)
  +        AstTestFactory.classTypeAlias(
  +                "B", null, Keyword.ABSTRACT, null, null, null)
               .isAbstract,
           isTrue);
     }
  
positive.code:   }
  
    void test_isSingleQuoted() {
      var b = AstTestFactory
          .interpolationExpression(AstTestFactory.identifier3('bb'));
      // "
      {
        var a = AstTestFactory.interpolationString('"a', "a");
  
negative.code:   void test_getEndToken_nonEmpty() {
      NodeList<AstNode> list =
          astFactory.nodeList<AstNode>(AstTestFactory.argumentList());
      AstNode node = AstTestFactory.parenthesizedExpression(
          AstTestFactory.booleanLiteral(true));
      list.add(node);
      expect(list.endToken, same(node.endToken));
    }
  