Sorry I fix a namespace problem and now it works in gambit scheme and in r5rs language of racket.
About normal mode in vim: I meant that it can be used as a real time scripting language. Suppose that you write your own program, It will be easy for the user to press ESC write dynamic forth expression and press enter. If he will do the same with arc, he will have to worry about parentheses. He will also have trouble using the result of the last calculation.
