You can "pass" information from one macro to another by binding
information to an identifier defined to be a syntax parameter that
both macros have in scope. You would need to functionally update its
value for each rebinding. Its value would be retrievable with
syntax-local-value.
Like this, am I close? I tried to make a shortest possible example.
But it does not work as I expected: it prints "my-info =
#<set!-transformer>" rather than '(new-info).
#lang racket
(require (for-syntax syntax/parse syntax/transformer)
racket/stxparam)
(define-syntax-parameter my-info '())
(define-syntax (access stx)
(syntax-parse stx
((_)
(printf "my-info = ~v\n" (syntax-local-value #'my-info))
#''ok)))
(define-syntax (save stx)
(syntax-parse stx
[(_ body:expr)
#'(syntax-parameterize ((my-info
(cons 'new-info (syntax-local-value
#'my-info))))
body)]))
(save
(access))
Best regards,
Dmitry
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