* bug#1734: a bug in elisp?
@ 2008-12-30 5:44 Peter Mao
0 siblings, 0 replies; 2+ messages in thread
From: Peter Mao @ 2008-12-30 5:44 UTC (permalink / raw)
To: bug-gnu-emacs
please see: http://paste.lisp.org/display/72772
run each function at least twice to see the problem.
both "persistent" and "notpersistent" should output (0 1), but the
variable "mylist" is persistent in "persistent"
I don't understand this at all. tried irc #emacs but couldn't get any takers.
Peter
^ permalink raw reply [flat|nested] 2+ messages in thread
* bug#1734: a bug in elisp?
@ 2008-12-30 6:39 Geoff Gole
0 siblings, 0 replies; 2+ messages in thread
From: Geoff Gole @ 2008-12-30 6:39 UTC (permalink / raw)
To: Peter Mao, 1734
This is normal. The list structure constructed by '(0) is conceptually
constant in the function, but remains mutable and is not protected in
any way. When you destructively modify it with nconc, the 'constant'
will change.
The solution: don't do that.
^ permalink raw reply [flat|nested] 2+ messages in thread
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