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[racket] #lang

From: Shriram Krishnamurthi (sk at cs.brown.edu)
Date: Sun May 15 00:35:35 EDT 2011		 
If you really wanted to accommodate all comers,

- no #lang => language is BSL
- all other languages need their own #lang line

That way, on day students can start programming without any magical
incantations.  For everyone else, there is some "ceremony" they go
through, during which they are told what to put in the #lang line.

(Of course I'm glossing over the #lang bsl =/= BSL from menu, which is
a real annoyance.)

Shriram
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