Matthew Flatt wrote at 06/14/2009 09:34 AM:
I see no substantial technical advantage for any of the choices of syntax, but there's a significant advantage in picking just one. All else being equal, a single syntax makes the language easier to learn, documentation easier to read, parsers easier to implement and extend, etc. So, while I'm unsure that "#:" should be the syntax of keywords forever, I'm sure that I don't want to support an additional ":" prefix right now.
While I think ":" is superior to "#:", I would not advocate switching to ":" if doing so meant breaking code that used "#:". Except perhaps in a major new PLT release (e.g., 5.0).
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