(cons '#3=(p q r) '(x y . #3#))If the single-quote reader macro were defined in this way:
(set-macro-character #\' ;incorrect
#'(lambda (stream char)
(declare (ignore char))
(list 'quote (read stream))))
then each call to the single-quote reader macro function would establish independent contexts for the scope of read information, including the scope of identifications between markers like ``#3='' and ``#3#''. However, for this expression, the scope was clearly intended to be determined by the outer set of parentheses, so such a definition would be incorrect. The correct way to define the single-quote reader macro uses recursive-p:
(set-macro-character #\' ;correct
#'(lambda (stream char)
(declare (ignore char))
(list 'quote (read stream t nil t))))
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