mutable default parameter problem [Prothon]

[Paul Rubin]

Christopher T King <squirrel at WPI.EDU> writes:
> Lisp and Scheme do the same thing:
> 
> (set! a 5)	<- sets a variable (i.e. changes its value)
> (eq? a 6)	<- tests equality (returns true or false)

Actually just Scheme.  Traditional Lisp uses (setq a 5) and (eq a 6).
For less frequently used predicates, Lisp sometimes uses the -p convention,
similar to your ? convention.