Language extensibility (was: Why is tcl broken?)

[Eugene Leitl]

Jerome Kalifa writes:

 > > Well *Lisp* dates back to the late 50s.  Scheme may be from 75,
 > > but Lisp is a different matter.  And lambda calculus is, what,
 > > 1949?
 > > 
 > 
 > No, as a mathematical theory, it was developed before the war.

Church, A., The Calculi of Lambda Conversion, Princeton University
Press, Princeton, N.J., 1941