anchor.diff:    void test_lookUpInheritedConcreteGetter_undeclared() {
       // class A {
       // }
  -    LibraryElementImpl library =
  -        ElementFactory.library(createAnalysisContext(), "lib");
  +    LibraryElementImpl library = _newLibrary();
       ClassElementImpl classA = ElementFactory.classElement2("A");
       (library.definingCompilationUnit as CompilationUnitElementImpl).types =
           <ClassElement>[classA];
  
positive.code:     // class A {
      //   m() {}
      // }
      LibraryElementImpl library =
          ElementFactory.library(createAnalysisContext(), "lib");
      ClassElementImpl classA = ElementFactory.classElement2("A");
      String methodName = "m";
      MethodElement method = ElementFactory.methodElement(methodName, null);
  
negative.code:   }
  
    void test_lookUpMethod_undeclared_recursive() {
      LibraryElementImpl library = _newLibrary();
      ClassElementImpl classA = ElementFactory.classElement2("A");
      ClassElementImpl classB = ElementFactory.classElement("B", classA.type);
      classA.supertype = classB.type;
  