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document lazy restriction, try to improve description a little.

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svn: r10418
This commit is contained in:
Eli Barzilay 2008-06-23 04:36:05 +00:00
parent b7839a4ec3
commit 24f54b8dcc
1 changed files with 5 additions and 1 deletions
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6
collects/scribblings/reference/promise.scrbl
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@ -25,7 +25,11 @@ to produce its value.}
@defform[(lazy expr)]{ @defform[(lazy expr)]{
Like @scheme[delay], except that if @scheme[expr] produces a promise, Like @scheme[delay], except that if @scheme[expr] produces a promise,
then the promise is @scheme[force]d to obtain a value.} then this promise is @scheme[force]d to obtain a value. In other
words, this form creates a kind of a composable promise, which is
mostly useful for implementing lazy libraries and languages. Also
note that the @scheme[expr] in this case is restricted to one that
produces a single value.}
@defproc[(force [v any/c]) any]{ @defproc[(force [v any/c]) any]{