Re: Forgot to CC this

[Guy.Steele at CMU-10A]

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Date: 11 November 1980 1456-EST (Tuesday)
From: Guy.Steele at CMU-10A
To: RICH at MIT-AI (Charles Rich)
Subject:  Re: Using macros in Mapping functions

While it is true that one uses macros for more than defining simple open-coded
functions, if one is using a macro for more than just this, it probably
doesn't make sense to MAP that macro.  Indeed, that's the problem: the mapping
function can't tell whether the macro is doing that simple job or something
more complicated.  The DEFSUBST mechanism provides a way to say that a
macro-like thing in fact is restricted to this interesting special case.
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