[racket] another mini-tutorial: a racket slice: munging IRC logs

>> I like how you show one way of converting a match to an object, and then
>> show a better way. What I did not like very much is how the first way is
>> really verbose and made me question whether to read on, and in
>> retrospect the way using match isn't much less verbose. Wouldn't a
>> simple (apply on-action (rest a-match)) work?
>
> Fortunately, `match' provides some features that make this much nicer.
>  Here's a new version (untested):

Ok, second version of parse-irc has been updated to use Sam's version
instead.  Thanks!