gistfile1.js

!function(){
  
  function fakeLength(fn, length) {
    if (length == fn.length) return fn;
    var fakeArgs = [];
    while(length--) fakeArgs.push('$fakeArg'+length);
    return eval('(function('+fakeArgs.join(',')+'){ return fn.apply(this, arguments); })');
  }
    
  Function.prototype.allRequired = function(){
    var fn = this,
        wrapped = function(){
          if (arguments.length >= fn.length)
            return fn.apply(this, arguments);
          else
            throw new Error('Oh Shit...');
        };
    return fakeLength(wrapped, fn.length);
  }
}();