gistfile1.js

function SomeObject() {
   this.x = 0;
}
SomeObject.prototype = (function() {
   return { foo: foo
          , bar: bar }

   function foo() { return bar() } /* function definition */
   function bar() { return foo() }

   var x = function() { } /* function expression - never executes */
})()

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The order it is represented in the syntax tree:

function SomeObject() {
   this.x = 0;
}
SomeObject.prototype = (function() {
   var x
   function foo() { return bar() }
   function bar() { return foo() }
 
   return { foo: foo, bar: bar }
   x = function() { }
})()