I wrote a simple program that determines whether a piece of syntax is original
in two different ways:
(define-syntax (print-original stx)
(syntax-case stx ()
[(_ datum)
(begin
(displayln (syntax-original? #'datum))
#'#'datum)]))
(syntax-original? (print-original 'foo))
Running it prints #f, then #t. This seems to imply that #'datum is not
considered syntax-original? within the syntax transformer, but in the
expansion, it is. Stepping though the expression within the macro stepper, the
identifier always seems to be considered original, so I would expect both cases
to be #t.
Why is the result of syntax-original? different within the two contexts? If
this is the intended behavior, could it maybe be explained in the documentation?
Thanks,
Alexis
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