Subject: Re: bug#31635: mapcon hangs emacs 24.5.1 of debian

From: Noam Postavsky <[email-masked]>
Date: Tue, 29 May 2018 07:18:05 -0400

Dave Goel <[email-masked]> writes:

> Per kenzo of #emacs, bug also exists in build 27 on a mac

On my build of master I don't get a hang, I get this error:

Debugger entered--Lisp error: (circular-list (nil nil . #2))
  nconc((nil nil nil . #2) (nil nil . #2) (nil nil . #3))
  apply(nconc ((nil nil nil . #4) (nil nil . #4) (nil nil . #5)))
  mapcon(identity (nil nil nil . #3))

On 26.1 the debugger hangs when trying to print this though (that is
Bug#31146).