identifers from nested syntax-rules macro

[jcubic]

This simple macro doesn't work:

(define-syntax foo
  (syntax-rules ()
    ((_ a)
     (cond ((zero? a) 'zero)
           (else 'other)))))

(print (foo 10))

It throws an error because else got renamed to #:else.

[jcubic]

That one case was fixed, the cond/else does not work inside syntax-rules, but this is just a hack.

For now, I will just put it as a limitation of LIPS:

You can use symbols inside lisp macros that will be used in syntax-rules macros because symbols will be gensyms. As a workaround, you can use what cond is doing:

(and (symbol? x)
     (or (eq? x 'else)
         (eq? (--> (new lips.LString (x.literal)) (cmp "else")) 0)))

This could be abstracted into some small function. Not sure about the name gensym=? is once but I would expect both arguments to be gensyms.