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Add description of what #:freevars/#:freevar does.

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svn: r13701
This commit is contained in:
Stevie Strickland 2009-02-17 18:26:24 +00:00
parent 64a68db15d
commit 792dc70ea6
1 changed files with 12 additions and 2 deletions
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14
collects/scribblings/reference/contracts.scrbl
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@ -693,7 +693,12 @@ exported without a contract.
The @scheme[blame-id] is used for the positive positions of The @scheme[blame-id] is used for the positive positions of
contracts paired with exported @scheme[id]s. Contracts broken contracts paired with exported @scheme[id]s. Contracts broken
within the @scheme[with-contract] @scheme[body] will use the within the @scheme[with-contract] @scheme[body] will use the
@scheme[blame-id] for their negative position.} @scheme[blame-id] for their negative position.
If a free-var-list is given, then any uses of the free variables
inside the @scheme[body] will be protected with contracts that
blame the context of the @scheme[with-contract] form for the positive
positions and the @scheme[with-contract] form for the negative ones.}
@defform*[[(define/contract id contract-expr free-var-list init-value-expr) @defform*[[(define/contract id contract-expr free-var-list init-value-expr)
(define/contract (head args) contract-expr free-var-list body ...+)]]{ (define/contract (head args) contract-expr free-var-list body ...+)]]{
@ -708,7 +713,12 @@ a contract region. The definition itself is responsible for positive
@scheme[id] outside of the definition must meet the negative @scheme[id] outside of the definition must meet the negative
positions of the contract. Since the contract boundary is positions of the contract. Since the contract boundary is
between the definition and the surrounding context, references to between the definition and the surrounding context, references to
@scheme[id] inside the @scheme[define/contract] form are not checked.} @scheme[id] inside the @scheme[define/contract] form are not checked.
If a free-var-list is given, then any uses of the free variables
inside the @scheme[body] will be protected with contracts that
blame the context of the @scheme[with-contract] form for the positive
positions and the @scheme[with-contract] form for the negative ones.}
@defform*[[(contract contract-expr to-protect-expr @defform*[[(contract contract-expr to-protect-expr
positive-blame-expr negative-blame-expr) positive-blame-expr negative-blame-expr)