from preamble:

"Change Set:		nilTrueFalseInLiteralArray-avi
Date:			16 February 2004
Author:			Avi Bryant

Modifies Scanner>>scanLitVec to be ANSI-compliant and treat #(nil true
false) as a collection of an UndefinedObject and two Booleans, rather
than as three Symbols.  Includes a test case (which also ensures that
#(#nil #true #false) and #(#'nil' #'true' #'false') still contain
symbols)."!
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