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.

It's not line count/characters as much as abstractions.

Perl can do certain things in one line and small numbers of characters, but it's domain-specific. Start writing complex programs and you have to do grunt work like all the other languages.