anchor.diff:  
     test('Masked local function', () {
       var local = 42;
  -    dummy() => print("Bad invocation of local function: $local");
  +    dummy() => print('Bad invocation of local function: $local');
       expect(() => spawnDomFunction(dummy), throws);
     });
   }
  
positive.code:   });
  }
  
  isolateMainTrampoline() {
    final future = spawnDomFunction(isolateMain);
    port.receive((msg, parentPort) {
      future.then((childPort) {
        childPort.call(msg).then((response) {
  
negative.code: import 'dart:html';
  import 'dart:isolate';
  
  childDomIsolate() {
    port.receive((msg, replyTo) {
      if (msg != 'check') {
        replyTo.send('wrong msg: $msg');
  