text: //// [objectTypesIdentityWithCallSignatures3.js]
  // object types are identical structurally
  
  var a;
  
  function foo2(x) {
  }
  
  function foo3(x) {
  }
  
  function foo4(x) {
  }
  
  function foo13(x) {
  }
  
  function foo14(x) {
  }
  
  function foo14b(x) {
  }
  
  function foo15(x) {
  }
  