anchor.diff:        (String result) { Expect.equals(expectedResult, result); });
   }
   
  +testStaticInvocation() {
  +  testDart2Dart('main(){var x=Math.parseDouble("1");}');
  +}
  +
   main() {
     testSignedConstants();
     testGenericTypes();
  
positive.code:   testNativeMethods();
    testPrefixIncrements();
    testConstModifier();
    testSimpleFileUnparse();
    testSimpleObjectInstantiation();
    testSimpleTopLevelClass();
  
negative.code: interface Dynamic {}
  interface Null {}
  assert() {}
  class Math {
    static double parseDouble(String s) => 1.0;
  }
  ''';
  
  testDart2Dart(String src, [void continuation(String s)]) {
  