From: Michael Heerdegen <michael_heerdegen@web.de>
To: emacs-pretest-bug@gnu.org
Subject: bug#748: Elisp: lexical-let and cyclic structures
Date: Wed, 20 Aug 2008 15:57:16 +0200 [thread overview]
Message-ID: <1219240636.0@debian> (raw)
When using the reader constructs `#N=' and `#N#' for cyclic
structures, lexical-let sometimes produces errors which don't occur
with let.
Example: Eval the following:
(defun f (start)
(lexical-let (start start) ;; return a closure
#1=(lambda (x) (if (= x start) x
(+ x (#1# (1- x)))))))
Then evaluating f ends with an error:
(f 3)
"Variable binding depth exceeds max-specpdl-size"
The problem also occurs without lambdas. Examples:
(let () '#1=(#1#)) ;; ==> (#0)
(lexical-let () '#1=(#1#)) ;; Error
(let ((x '#1=(#1#))) (lexical-let () x)) ;; ==> (#0)
`#1=(#1#) ;; Error
next reply other threads:[~2008-08-20 13:57 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-08-20 13:57 Michael Heerdegen [this message]
2008-08-21 1:12 ` bug#748: Elisp: lexical-let and cyclic structures Stefan Monnier
2011-07-09 17:51 ` Glenn Morris
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