avoid define-syntax-parser for older versions

txexpr/private/define-provide-safe-match.rkt

@@ -3,7 +3,6 @@
 (provide define+provide+safe+match)
 
 (require racket/match
-         syntax/parse/define
          (for-syntax racket/base
                      racket/syntax
                      syntax/parse
@@ -32,45 +31,47 @@
       [(stx-pair? stx)
        (datum->syntax stx (cons id (stx-cdr stx)) stx stx)])))
 
-(define-syntax-parser define+provide+safe+match
+(define-syntax define+provide+safe+match
+  (λ (stx)
+    (syntax-parse stx
 
-  [(d (head . args)
-      contract:expr
-      value-body:expr ...+
-      #:match-expander match-transformer:expr)
-   #:with fn-expr (syntax/loc this-syntax (λ args value-body ...))
-   (syntax/loc this-syntax
-     (d head contract fn-expr #:match-expander match-transformer))]
+      [(d (head . args)
+          contract:expr
+          value-body:expr ...+
+          #:match-expander match-transformer:expr)
+       #:with fn-expr (syntax/loc stx (λ args value-body ...))
+       (syntax/loc stx
+         (d head contract fn-expr #:match-expander match-transformer))]
 
-  [(_ name:id
-      contract:expr
-      value:expr
-      #:match-expander match-transformer:expr)
-   #:with internal-name (generate-temporary #'name)
-   #:with contract-name (generate-temporary #'name)
-   #:with make-name-match-transformer (generate-temporary #'name)
-   #'(begin
-       (define internal-name (let ([name value]) name))
+      [(_ name:id
+          contract:expr
+          value:expr
+          #:match-expander match-transformer:expr)
+       #:with internal-name (generate-temporary #'name)
+       #:with contract-name (generate-temporary #'name)
+       #:with make-name-match-transformer (generate-temporary #'name)
+       #'(begin
+           (define internal-name (let ([name value]) name))
 
-       (begin-for-syntax
-         (define (make-name-match-transformer name)
-           (with-syntax ([name name]) match-transformer)))
+           (begin-for-syntax
+             (define (make-name-match-transformer name)
+               (with-syntax ([name name]) match-transformer)))
 
-       (define-match-expander name
-         (make-name-match-transformer (quote-syntax internal-name))
-         (variable-like-transformer (quote-syntax internal-name)))
+           (define-match-expander name
+             (make-name-match-transformer (quote-syntax internal-name))
+             (variable-like-transformer (quote-syntax internal-name)))
 
-       (provide name)
+           (provide name)
 
-       (module+ safe
-         (require racket/contract/base)
+           (module+ safe
+             (require racket/contract/base)
 
-         (define-module-boundary-contract contract-name internal-name contract
-           #:name-for-blame name)
+             (define-module-boundary-contract contract-name internal-name contract
+               #:name-for-blame name)
 
-         (define-match-expander name
-           (make-name-match-transformer (quote-syntax contract-name))
-           (variable-like-transformer (quote-syntax contract-name)))
+             (define-match-expander name
+               (make-name-match-transformer (quote-syntax contract-name))
+               (variable-like-transformer (quote-syntax contract-name)))
 
-         (provide name)))])
+             (provide name)))])))