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Racketize the `version' collection.
Also some other style things, and get rid of the redundant "doc.txt".
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|@@ -1,47 +0,0 @@|
|-_version_: Racket version checking|
|-The version collection contains several version-related pieces that|
|-are used by Racket. First, the "check.ss" module provides a single|
|-This procedure checks the currently available version on the Racket|
|-website (doanload.racket-lang.org), and returns a value that indicates|
|-your current state -- one of these:|
|- * `ok|
|- You're fine.|
|- * `(ok-but ,version)|
|- You have a fine stable version, but note that there is a newer|
|- alpha version available|
|- * `(newer ,version)|
|- You have an old version, please upgrade to `version'|
|- * `(newer ,version ,alpha)|
|- You have an old-but-stable version, please upgrade to `version';|
|- you may consider also the newer alpha version|
|- * `(error ,message [,additional-info])|
|- An error occurred, the message is a string that indicates the|
|- The third (optional) value is a string that can be shown as the|
|- system error that happened. This string will always be|
|- parenthesized, so `message' is a short error and|
|- `(string-append message " " additional-info)' is a verbose one.|
|-The second functionality that is provided by this collection is in the|
|-_patchlevel_ module. This module provides a single value:|
|-which is an integer that indicates the current patch level. This is|
|-normally zero, but may be updated by patches to DrRacket.|
|-Finally, the "tool.rkt" makes DrRacket use both features:|
|-* the patchlevel appears as a version `pN' suffix in DrRacket (but the|
|- binary version as reported by `(version)' is not changed);|
|-* it is possible to periodically check whether a new Racket|
|- distribution is available for download.|
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