Python stack with vc and hg on 26.1 (was [ANNOUNCE] Emacs 26.1 released)

[Mike Kupfer]

Bob Friesenhahn wrote:

> Something else I notice is that when I open a file which is in a
> Mercurial repository, the /usr/bin/hg program crashes and I get an
> Ubuntu crash report.  The Ubuntu crash report screen does not allow me
> to copy text from it, but the command executed which crashed starts
> with '/usr/bin/python /usr/bin/hg log -r . -l1 -template ...'.  This
> does not happen with emacs-25.3.  The crash is due to use of a None
> value.  The version of Mercurial provided by this Ubuntu release is
> 2.8.2.

I hit something like that on Oracle Linux 7.  Here's my workaround:

  (setq vc-hg-symbolic-revision-styles nil)

mike