Fastest prototyping language?

I want to write programs as fast as I can. Which language should I learn?

Using program length as a rough indicator, Forth is the choice. Samples I've seen like web servers, operating systems, database managers, etc. are significantly shorter in Forth.

But I've seen some really short Perl and Haskell routines too.

And Lisp is supposed to allow you to work at such high levels of abstraction that it should also make short applications.

Ruby gets a lot of comments about short line counts compared to Perl and Python.

Assuming
   -identical toolset library functionality,
   -maximum expertise in all the candidate languages
   -no concern of readability, "transparent" design, or 
    execution speed
which language syntax will allow you to write your program fastest?

In b4 machine code.

I have information relevant to this conversation.

"What do you think of ML and its derivatives?

Most hackers I know have been disappointed by the ML family. Languages with static typing would be more suitable if programs were something you thought of in advance, and then merely translated into code. But that's not how programs get written.

The inability to have lists of mixed types is a particularly crippling restriction. It gets in the way of exploratory programming (it's convenient early on to represent everything as lists), and it means you can't have real macros.

http://www.paulgraham.com/lispfaq1.html