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Sam Tobin-Hochstadt eacda65291 Add `defined?' assertions to fix DrRacket.
original commit: e70ccafd7b591df218a1ae036f599c671eb57824
2010-12-08 18:53:56 -05:00
collects Add `defined?' assertions to fix DrRacket. 2010-12-08 18:53:56 -05:00