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Changed in the early/mid 80s I think. AI Memo 848 (Revised Revised Report) from 1985 has it already as an 'essential special form': (lambda (var1 ...) expr1 expr2 ...)

R1RS does not permit it. And: In the the R1RS syntax BNF there is a (DEFINE (<identifier> <identifier list>) <form>) with one form. But later in the document it is a '<form list>'... Then the LAMBDA syntax has a BODY, but it is only a FORM...




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