tests/test-backwards-remove.t

phabricator: allow local revisions to be specified with `phabupdate`

It's way easier and less error prone to specify a revset after importing a
series than to manually type in a series of Differentials.

Unlike most revision oriented commands, this requires the `--rev` option
explicitly because the existing `DREVSPEC` doesn't need to have the leading 'D',
and therefore the meaning is ambiguous.  I wouldn't have a problem giving
precedence to the local revnum, but `phabread` and `phabimport` also use
DREVSPEC, and local revisions make no sense there.  I would be fine with
modifying that definition to require the leading 'D', but I'm not sure how many
people are used to not specifying it.

Differential Revision: https://phab.mercurial-scm.org/D9356

  $ hg init
  $ echo This is file a1 > a
  $ hg add a
  $ hg commit -m "commit #0"
  $ ls -A
  .hg
  a
  $ echo This is file b1 > b
  $ hg add b
  $ hg commit -m "commit #1"
  $ hg co 0
  0 files updated, 0 files merged, 1 files removed, 0 files unresolved

B should disappear

  $ ls -A
  .hg
  a