[racket] TLS "atom?" definition for Scheme does not work in DrRacket

From: Daniel Feltey (dfeltey at ccs.neu.edu)
Date: Tue Mar 3 23:43:31 EST 2015

Just one more question, for clarification. Are you using the `lambda` form in BSL? I ask because several examples in this thread have been using `lambda`, but I don't think that lambda expressions are actually valid in either of the beginning student languages, though I would expect you to receive an error about lambda being undefined in that situation.


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