Chibi doesn't check single argument to `+` and `*`

[jpellegrini]

Hello!

It looks like Chibi doesn't check single argument to + and *:

;; a is not bound:
;;
> (- 'a)
ERROR on line 2: invalid type, expected Number: a
> (/ 'a)
ERROR on line 5: invalid type, expected Number: a
> (+ 'a)
a                  ;; <== oops!
> (* 'a)
a                  ;; <== oops!

[jpellegrini]

I just opened the issue and I see that both Guile and Gauche do the same. Is this allowed by the standard? If it is, I apologize for the noise!

[mnieper]

In R7RS, "it is an error" but an implementation need not signal an error. While Chibi's behavior may hide programming errors, it is allowed by the standard.

[jpellegrini]

Ok I understand... But still, + is returning a wrong value as result. Anyway, I'm ok with closing the bug, no problem.