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Source for wiki ImproperCircularLists version 1

author

cowan

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198.185.18.207

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ImproperCircularLists

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Here are the valid uses of improper lists in R7RS-small in contexts where lists (as opposed to arbitrary objects) are expected:

 * As a `lambda`-list
 * As the last argument of `append`
 * As the argument to `list-copy`, which then returns an improper list that is `equal?` to the argument
 
And of circular lists:

 * As the list argument to `list-ref`
 * As the list arguments to `map` and `for-each` (though it is an error if all arguments are circular)

time

2012-11-08 07:51:07