Racket v6.2.1
Version 6.2.1 patches the recent v6.2 release in three small ways:
* For the How to Design Programs teaching languages, DrRacket offers
an option to use the old style for printing the constants `true`,
`false`, and `empty` instead of `#true`, `#false`, and `'()`.
* The teaching languages come with some additional functions to match
the August 2015 stable release of HtDP 2nd edition.
* A repair to the compiler avoids an infinite loop at compile time for
certain expressions that should loop forever at run time.
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