[julia-users] What's the relationship between a function and an anonymous function?

[yfractal]

They seem have similar "code".

eg:

  function fun(x::Int)
   x
  end

  function fun(x)
  x
  end

  fun.env.defs.func.code

  AST(:($(Expr(:lambda, {:x}, {{},{{:x,:Any,0}},{}}, :(begin
        return
        end)))))

  func2 = (x) -> x
  func2.code

  AST(:($(Expr(:lambda, {:(x::Any)}, {{},{{:x,:Any,0}},{}}, :(begin  # 
none, line 1:
        return x
    end)))))

 And function has sig(signature?)

 fun.env.defs.sig
 (Any,)

I guess, a function has one name and many defs(definition?). And Julia will 
do dispatch base on the "sig". 

Is it right? Please correct me, if I made any mistakes. Please tell me more 
about Julia function!

But how Julia do dispatch base on the "sig"? Where is the "function" code 
in Julia source code?