Basic syntax-rules macro

[jcubic]

I was just testing basic syntax-rules example:

(define-syntax quux
  (syntax-rules ()
    ((_ (x ... a b) ...)
     '((x ... b a) ...))))

(quux (1 2 3 4)
      (5 6 7 8)
      (9 10 11 12))

It should be evaluated to:

((1 2 4 3) (5 6 8 7) (9 10 12 11))

but Marwood evaluates into:

((1 2 5 6 9 10 4 3) (1 2 5 6 9 10 8 7) (1 2 5 6 9 10 12 11))

It seems that this library does not have enough unit tests. It seems that there is not even a single unit test for syntax-rules.