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Re: Masinter's remarks on #,

While READ is many-to-one, most of the identifications are merely syntactic;
that is (x . (a b c)) and (x a b c) really are the same program fragment
as far as program semantics go, while #,X and 3  (when X=3) are semantically

One test for the distinction between syntactic and semantic macro characters is
whether READ = READ-PRINT-(new environment)-READ. The difficult cases then
remain #+ #- #.  and #,.