In general I love internal define and have been using it heavily.
After the initial infatuation, I still love it. I've also come to
appreciate that sometimes let can be clearer. I like having the
choice.
Another way internal define can bite you is if you're not real crisp
on your understanding of certain forms with optional parts. For
instance syntax-case clauses. Let's say I have a friend (ahem) who
didn't really grok the optional guard/fender part, but that hadn't
mattered when writing stuff like:
(syntax-case stx ()
[(_ my pattern)
(let ([id rhs])
#'(my template))])
One day tries:
(syntax-case stx ()
[(_ my pattern)
(define id rhs)
#'(my template)])
This friend of mine (cough) was confused for awhile before figuring it out.
Of course the primary problem here is me^H^H my friend didn't know
this aspect of syntax-case clauses. I'm just saying that switching
from let to define can flush out some misunderstandings. Shrug.
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