Thanks for the info. I think it's a bug in the expander, and I have a repair, but I think that repair might point to another bug that I'm still investigating.
At Mon, 20 Jul 2015 12:56:49 -0400, "Alexander D. Knauth" wrote: > I don't really know what's going on, but this might help: > > ;; It seems to be introducing the definition correctly, but not the use: > ;; this works > (let () > (def) ; no difference between (def) and (define id 5) > id) > > ;; this doesn't > (let () > (def) > (use)) ; but there is a difference between (use) and id > > ;; and this doesn't either > (let () > (define id 5) > (use)) > > On Jul 20, 2015, at 12:35 PM, Spencer Florence <spen...@florence.io> wrote: > > > Hello, > > > > I'm trying to update some code to the new expander. The below code works on > 6.2 but fails on the new expander with an unbound identifier error. > > > > #lang racket > > (require (for-syntax syntax/parse)) > > > > ;; a standard context for identifiers > > (define-for-syntax ctx #'ctx) > > > > ;; create an ID with the context `ctx`, and the current > > ;; expander mark (so that the mark is canceled later), > > ;; and the location loc > > (define-for-syntax (make-id loc) > > (syntax-local-introduce > > (datum->syntax ctx 'id loc))) > > > > ;; This introduces a binding > > (define-syntax (def stx) > > (syntax-parse stx > > [(def) > > (with-syntax ([id (make-id #'here)]) > > #'(define id 5))])) > > > > ;; this attempts to use the binding introduced by `def` > > (define-syntax (use stx) > > (syntax-parse stx > > [(use) > > (with-syntax ([id (make-id #'here)]) > > #'id)])) > > > > ;; this works > > #; > > (begin > > (def) > > (use)) > > > > ;; this fails > > (let () > > (def) > > (use)) > > > > -- > > You received this message because you are subscribed to the Google Groups > "Racket Users" group. > > To unsubscribe from this group and stop receiving emails from it, send an > email to racket-users+unsubscr...@googlegroups.com. > > For more options, visit https://groups.google.com/d/optout. > > -- > You received this message because you are subscribed to the Google Groups > "Racket Users" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to racket-users+unsubscr...@googlegroups.com. > For more options, visit https://groups.google.com/d/optout. -- You received this message because you are subscribed to the Google Groups "Racket Users" group. To unsubscribe from this group and stop receiving emails from it, send an email to racket-users+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
