rebase: make --dest understand revsets

hgext/rebase.py

@@ -182,7 +182,7 b' def rebase(ui, repo, **opts):'
                 branch = repo[None].branch()
                 dest = repo[branch]
             else:
-                dest = repo[destf]
+                dest = scmutil.revsingle(repo, destf)
 
             if revf:
                 rebaseset = repo.revs('%lr', revf)

tests/test-rebase-parameters.t

@@ -158,12 +158,12 b" Rebase with base == '.' => same as no ar"
   $ cd ..
 
 
-Rebase with dest == `hg branch` => same as no arguments (from 3 onto 8):
+Rebase with dest == branch(.) => same as no arguments (from 3 onto 8):
 
   $ hg clone -q -u 3 a a3
   $ cd a3
 
-  $ hg rebase --dest `hg branch`
+  $ hg rebase --dest 'branch(.)'
   saved backup bundle to $TESTTMP/a3/.hg/strip-backup/*-backup.hg (glob)
 
   $ hg tglog