I came across some odd behavior today regarding readtables. Specifically,
(make-readtable base) seems to produce a readtable that is operationally
different from `base` when reading s-expression comments. Consider the
following code:
; this works
(read (open-input-string "(1 . 2 #;3)")) ; => '(1 . 2)
; this fails
(parameterize ([current-readtable (make-readtable (current-readtable))])
(read (open-input-string "(1 . 2 #;3)"))) ; => read: illegal use of `.’
(see http://pasterack.org/pastes/48735 for a working demo)
Is this a bug, or is it intentional? If it’s the latter, is it documented
anywhere?
Alexis
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