something parse wrong.

[Gaubee]

function fn(){};
(function fn(){});

all of those are parse as

  Function(
      "fn",
      [],
      []
  )

but

(function fn(){  /* fn is *Effective* in this Scope */  }());
console.log(typeof fn);// undefined  -->  but lost effective when out of "(   )";

[WJsjtu]

It doesn't work with js well.

var a = function(){
   var temp = 2;
   return function(init){
      return init + temp;
   }
};
console.log(a()(4));

It cannot point out what init is correctly.