[Please keep racket-lang in CC.]
> Is the help mainly for simpler #lang like Beg Stud? (#lang racket
> seems to have lots of place where [ appears and inside xexpr as well.
> So it may not be all that easy to keep track for Dr, I am guessing.)
It is meant to enforce a particular paren style for Racket. I'd say
it's more of a general Racket convention than a Beginner Student
convention, since it helps professional Racketeers as well.
Even though '[' is interchangeable with '(', the parens do have to
match with their corresponding ']' and ')'. Because of that, the
distinguished paren shapes help to localize paren mismatch errors when
they occur. e.g. the error that's produced when tryting to evaluate:
(define x 16)
(cond [(equal? x 42
'ok])
will point at the ']'.
The editor has these paren styles built in to specific forms. You can
see which forms get affected by looking at Preferences/Editing/Square
Bracket.
Personally, I would leave them on and let DrRacket manage the parens for me.
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