[fold: different for branches and bookmarks]

[Uwe Brauer]

   > On 12/19/2016 10:25 PM, Arne Babenhauserheide wrote:

   > The call `hg fold -r master -r feature` seems wrong. It will fold
   > '(master+feature)::. + .::(master+feature)' Most certainly not what
   > you want as master will be included in the resulting folded
   > changesets.

   > You want `hg fold --exact 'only(master, feature)'
that is supposed to work with branches as well?
For me it does not work.

Here is what I did

hg init
echo feature > new.el
hg add new.el
hg commit -m feature1
echo offical2 >> new.el
hg commit -m feature2
echo feature3 >> new.el
hg commit -m feature3
hg branch feature
echo feature > feature.el
hg add feature.el
hg commit -m feature
echo feature2 >> feature.el
hg commit -m feature2

And then I run 
hg fold --exact 'only(default, feature)'

And I obtain the following errors
** Unknown exception encountered with possibly-broken third-party extension hggit
** which supports versions 3.7 of Mercurial.
** Please disable hggit and try your action again.
** If that fixes the bug please report it to https://bitbucket.org/durin42/hg-git/issues
** Python 2.7.6 (default, Jun 22 2015, 18:00:18) [GCC 4.8.2]
** Mercurial Distributed SCM (version 4.0-rc)
** Extensions loaded: evolve, eol, hgk, hggit, fetch, rebase, shelve, largefiles, purge, histedit, pager, record, color, convert, keyword, strip, mq
Traceback (most recent call last):
  File "/usr/bin/hg", line 45, in <module>
    mercurial.dispatch.run()
  File "/usr/lib/python2.7/dist-packages/mercurial/dispatch.py", line 60, in run
    sys.exit((dispatch(request(sys.argv[1:])) or 0) & 255)
  File "/usr/lib/python2.7/dist-packages/mercurial/dispatch.py", line 126, in dispatch
    ret = _runcatch(req)
  File "/usr/lib/python2.7/dist-packages/mercurial/dispatch.py", line 216, in _runcatch
    return callcatch(ui, _runcatchfunc)
  File "/usr/lib/python2.7/dist-packages/mercurial/dispatch.py", line 225, in callcatch
    return func()
  File "/usr/lib/python2.7/dist-packages/mercurial/dispatch.py", line 205, in _runcatchfunc
    return _dispatch(req)
  File "/usr/lib/python2.7/dist-packages/mercurial/dispatch.py", line 901, in _dispatch
    cmdpats, cmdoptions)
  File "/usr/lib/python2.7/dist-packages/mercurial/dispatch.py", line 650, in runcommand
    ret = _runcommand(ui, options, cmd, d)
  File "/usr/lib/python2.7/dist-packages/mercurial/extensions.py", line 220, in closure
    return func(*(args + a), **kw)
  File "/usr/lib/python2.7/dist-packages/hgext/color.py", line 521, in colorcmd
    return orig(ui_, opts, cmd, cmdfunc)
  File "/usr/lib/python2.7/dist-packages/mercurial/extensions.py", line 220, in closure
    return func(*(args + a), **kw)
  File "/usr/lib/python2.7/dist-packages/hgext/pager.py", line 160, in pagecmd
    return orig(ui, options, cmd, cmdfunc)
  File "/usr/lib/python2.7/dist-packages/mercurial/dispatch.py", line 909, in _runcommand
    return cmdfunc()
  File "/usr/lib/python2.7/dist-packages/mercurial/dispatch.py", line 898, in <lambda>
    d = lambda: util.checksignature(func)(ui, *args, **cmdoptions)
  File "/usr/lib/python2.7/dist-packages/mercurial/util.py", line 1037, in check
    return func(*args, **kwargs)
  File "/usr/lib/python2.7/dist-packages/mercurial/extensions.py", line 220, in closure
    return func(*(args + a), **kw)
  File "/usr/lib/python2.7/dist-packages/mercurial/util.py", line 1037, in check
    return func(*args, **kwargs)
  File "/usr/lib/python2.7/dist-packages/hgext/mq.py", line 3540, in mqcommand
    return orig(ui, repo, *args, **kwargs)
  File "/usr/lib/python2.7/dist-packages/mercurial/util.py", line 1037, in check
    return func(*args, **kwargs)
  File "/usr/lib/python2.7/dist-packages/mercurial/extensions.py", line 220, in closure
    return func(*(args + a), **kw)
  File "/usr/lib/python2.7/dist-packages/mercurial/util.py", line 1037, in check
    return func(*args, **kwargs)
  File "/home/oub/ALLES/src/evolve/hgext/evolve.py", line 732, in warnobserrors
    ret = orig(ui, repo, *args, **kwargs)
  File "/usr/lib/python2.7/dist-packages/mercurial/util.py", line 1037, in check
    return func(*args, **kwargs)
  File "/home/oub/ALLES/src/evolve/hgext/evolve.py", line 3142, in fold
    targetphase = max(c.phase() for c in allctx)
ValueError: max() arg is an empty sequence