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A Proposal for Environments in Scheme

    Date: Fri, 20 May 88 11:49:26 PDT
    From: Pavel.pa@Xerox.COM

	Contains exactly those bindings described in the Scheme specification,
	except that a given implementation may not provide all of the optional
	features.  Thus, in this environment, APPEND may or may not accept an
	arbitrary number of arguments, LET may or may not allow the named variant,

Except LET isn't a variable.

Can you say:

  (SCHEME:LET ...)?

Presumably not, if the ":" syntax is taken to be an abbreviation for a
call on the ENVIRONMENT-REF procedure.