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Add duplicate checking to exports list.

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svn: r11761
This commit is contained in:
Stevie Strickland 2008-09-15 19:53:41 +00:00
parent e40c856660
commit deccda53ea
1 changed files with 7 additions and 1 deletions
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8
collects/scheme/private/contract.ss
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@ -225,7 +225,13 @@ improve method arity mismatch contract violation error messages?
[(expanded-bodies) (head-expand-all (cons #'body0
(syntax->list #'(body ...))))])
(begin
(check-exports (append unprotected protected) expanded-bodies)
(let* ([all-ids (append unprotected protected)]
[dupd-id (check-duplicate-identifier all-ids)])
(when dupd-id
(raise-syntax-error 'with-contract
"identifier appears twice in exports"
dupd-id))
(check-exports (append unprotected protected) expanded-bodies))
(with-syntax ([((protected-id id contract-id) ...)
(map (lambda (n)
(list n