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svn: r13725
This commit is contained in:
Robby Findler 2009-02-18 13:11:08 +00:00
parent cc29c603c0
commit cf856a33bf
1 changed files with 2 additions and 1 deletions
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3
collects/scheme/private/contract.ss
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@ -148,7 +148,7 @@ improve method arity mismatch contract violation error messages?
(define-syntax (define-struct/contract stx)
(syntax-case stx ()
[(_ name ([field ctc] ...))
[(_ name ([field ctc] ...) kwds ...)
(let ([fields (syntax->list #'(field ...))])
(unless (identifier? #'name)
(raise-syntax-error 'define-struct/contract
@ -176,6 +176,7 @@ improve method arity mismatch contract violation error messages?
(with-contract #:type struct name
(name struct:name id/ctc ...)
(define-struct name (field ...)
kwds ...
#:guard (λ (field ... struct-name)
(unless (eq? 'name struct-name)
(error (format "Cannot create subtype ~a of contracted struct ~a"