> On Nov 21, 2018, at 12:44 PM, Shu-Hung You
> <shu-hung....@eecs.northwestern.edu> wrote:
>
> It works, but it would be better if (X 'USE) can log information about
> its uses at B and C in addition to the source location A for debugging
> purpose. If I don't want to change the implementation of USE, is there
> a way for X to obtain the source information of B and C?
Stash it in a syntax property?
#lang racket
(require (for-syntax syntax/parse)
syntax/location syntax/parse/define)
(define log-error format)
(define void values)
(define vector values)
(define-syntax (X stx0)
(syntax-parse stx0
[(_ stx)
(define label (gensym 'L))
(define outer-stx (syntax-property stx0 'outer-stx))
#`(log-error "at ~a (~a) ; ~a ~a"
'#,label
(quote-srcloc-string #,(or outer-stx #'stx))
'#,(current-module-declare-name)
'#,(current-module-declare-source))]))
(define-syntax (USE stx)
#`(void (vector #,(syntax-property #'(X 'USE) 'outer-stx stx)))) ;; A
(X (or 'here #f))
(X 'there)
(USE) ;; B
(USE) ;; C
;; Result:
;; "at L (unsaved-editor:24.3) ; #f #f"
;; "at L (unsaved-editor:25.3) ; #f #f"
;; "at L (unsaved-editor:26.0) ; #f #f"
;; "at L (unsaved-editor:27.0) ; #f #f"
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