JSDoc should do more to interpret IIFEs

JSDoc does not detect functions created by compiling CoffeeScript functions with proper JSDoc comments. Here is a simple example:

x = 1

###*
   * Funtion to ...
###
a = () ->
  1

x = 1 or some other code had to be before the comment, otherwise CoffeeScript assigns the comment to the file outer anonymous function and not the inner function.

After compilation CoffeeScript generates the following JavaScript code:

// Generated by CoffeeScript 1.6.3
(function() {
  var a, x;

  x = 1;

  /**
     * Funtion to ...
  */


  a = function() {
    return 1;
  };

}).call(this);

On this code, JSDoc does not detect the a function.

If the var a, x; line is removed, JSDoc works fine.

Start with the compiled JavaScript example in the issue and trace JSDoc's handling of IIFEs and function detection; no repository file or test is named in the report. Done means the a function is detected when the generated var a, x; declaration remains, with a regression test covering this CoffeeScript output.