old_contents: // @flow
  var bla = require('./bla');
  
  var str: string = 'hello world!';
  
  function text(arg: string) {
      return "Hello world";
  }
  
  text(str);
  
  bla(str);
  
  function test() {
      return (
  	<div>
  	    "hello world"
  	</div>
      );
  }
  
new_contents: // @flow
  var bla = require('./bla');
  
  var str: number = 'hello world!';
  
  function text(arg: string) {
      return "Hello world";
  }
  
  text(str);
  
  bla(str);
  
  function test() {
      return (
  	<div>
  	    "hello world"
  	</div>
      );
  }
  
subject: make build fail