strange error message when rebasing (incorrectly) keyword extension

[Uwe Brauer]

Hi

I generated a test repo like this
 hg init
 hg bookmark master
 echo Upstream1 > main.txt
 hg add main.txt
 hg commit -m "Up one"
 hg bookmark exam
 echo exam1 > exam.txt
 hg add exam.txt
 hg commit -m "Exam 1"
 echo exam2 >> exam.txt
 hg commit -m "exam2"
 hg update master
 echo uwe-three >> main.txt
 hg commit -m "Uwe three"
 hg log -G

Then I run

hg rebase -s 2 -d 3
this is wrong it should be
hg rebase -s 1 -d 3

But the error message looks puzzeling 

rebasing 2:c70195814452 "exam2" (exam)
** 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.

I did this and repeated the process, then hg complained about another
3prd party extension, which had nothing to do with the problem, when
desactivation all extension I obtain

remote changed exam.txt which local deleted
use (c)hanged version, leave (d)eleted, or leave (u)nresolved? interrupted!

And I found out it is the
keyword extension which causes the following error message

(hg rebase -s 1 -d 3 works!)

traceback (most recent call last):
  File "/usr/bin/hg", line 43, in <module>
    mercurial.dispatch.run()
  File "/usr/lib/python2.7/dist-packages/mercurial/dispatch.py", line 59, in run
    sys.exit((dispatch(request(sys.argv[1:])) or 0) & 255)
  File "/usr/lib/python2.7/dist-packages/mercurial/dispatch.py", line 125, in dispatch
    ret = _runcatch(req)
  File "/usr/lib/python2.7/dist-packages/mercurial/dispatch.py", line 204, in _runcatch
    return _dispatch(req)
  File "/usr/lib/python2.7/dist-packages/mercurial/dispatch.py", line 887, in _dispatch
    cmdpats, cmdoptions)
  File "/usr/lib/python2.7/dist-packages/mercurial/dispatch.py", line 632, in runcommand
    ret = _runcommand(ui, options, cmd, d)
  File "/usr/lib/python2.7/dist-packages/mercurial/extensions.py", line 204, in closure
    return func(*(args + a), **kw)
  File "/usr/lib/python2.7/dist-packages/hgext/color.py", line 502, in colorcmd
    return orig(ui_, opts, cmd, cmdfunc)
  File "/usr/lib/python2.7/dist-packages/mercurial/extensions.py", line 204, 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 1017, in _runcommand
    return checkargs()
  File "/usr/lib/python2.7/dist-packages/mercurial/dispatch.py", line 978, in checkargs
    return cmdfunc()
  File "/usr/lib/python2.7/dist-packages/mercurial/dispatch.py", line 884, in <lambda>
    d = lambda: util.checksignature(func)(ui, *args, **cmdoptions)
  File "/usr/lib/python2.7/dist-packages/mercurial/util.py", line 1005, in check
    return func(*args, **kwargs)
  File "/usr/lib/python2.7/dist-packages/mercurial/extensions.py", line 204, in closure
    return func(*(args + a), **kw)
  File "/usr/lib/python2.7/dist-packages/mercurial/util.py", line 1005, in check
    return func(*args, **kwargs)
  File "/usr/lib/python2.7/dist-packages/hgext/mq.py", line 3519, in mqcommand
    return orig(ui, repo, *args, **kwargs)
  File "/usr/lib/python2.7/dist-packages/mercurial/util.py", line 1005, in check
    return func(*args, **kwargs)
  File "/usr/lib/python2.7/dist-packages/hgext/rebase.py", line 404, in rebase
    collapsef, target)
  File "/usr/lib/python2.7/dist-packages/hgext/rebase.py", line 688, in rebasenode
    labels=['dest', 'source'])
  File "/usr/lib/python2.7/dist-packages/mercurial/merge.py", line 1598, in update
    stats = applyupdates(repo, actions, wc, p2, overwrite, labels=labels)
  File "/usr/lib/python2.7/dist-packages/mercurial/merge.py", line 1259, in applyupdates
    complete, r = ms.preresolve(f, wctx)
  File "/usr/lib/python2.7/dist-packages/mercurial/merge.py", line 539, in preresolve
    return self._resolve(True, dfile, wctx)
  File "/usr/lib/python2.7/dist-packages/mercurial/merge.py", line 493, in _resolve
    labels=self._labels)
  File "/usr/lib/python2.7/dist-packages/mercurial/filemerge.py", line 681, in premerge
    return _filemerge(True, repo, mynode, orig, fcd, fco, fca, labels=labels)
  File "/usr/lib/python2.7/dist-packages/mercurial/filemerge.py", line 562, in _filemerge
    if not fco.cmp(fcd): # files identical?
  File "/usr/lib/python2.7/dist-packages/mercurial/extensions.py", line 204, in closure
    return func(*(args + a), **kw)
  File "/usr/lib/python2.7/dist-packages/hgext/keyword.py", line 738, in kwfilectx_cmp
    if (fctx._filerev is None and
AttributeError: 'absentfilectx' object has no attribute '_filerev'


Uwe Brauer