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Re: seq-mapn and circular lists

From: John Mastro
Subject: Re: seq-mapn and circular lists
Date: Wed, 14 Dec 2016 15:32:44 -0800

Plamen Tanovski <> wrote:
> Hi,
> while cl-map works fine on circular lists, seq-mapn just freezes
> (let ((l1 '#1=(1 . #1#)))
>   ; (map 'list #'+ '(3 4 5 7) l1)
>   (seq-mapn #'+ '(3 4 5 7) l1))
> Making the circular list with setcdr or nconc doesn't help. Any
> suggestions?

Indeed, seq-map and seq-mapn do not attempt to identify or handle circular
lists. My advice would be to avoid circular lists, or stick to `cl-map' if you
must accommodate them :)

Since seq.el is developed as part of Emacs, you can use `M-x report-emacs-bug'
to submit a feature request.


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