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.

And PG wouldn't make a strong leader? Practical all the suave Lisp noobs bone him.
Well, yes, that was the point. Normally I'd dismiss Arc out of hand as pointless reinvention, but if PG does somehow release it, there's a real hope for the Lisp community.

Also, Lisp seems to be getting a lot more exposure recently. Hopefully some fresh blood will flood out the stagnancy.

If not, all roads lead to Lisp anyway. The LAMP languages (excluding PHP) are a big leap up from most C and ALGOL derivatives.