diff -r 306f67906a6c -r cac35bef8aee hgext/evolve.py
--- a/hgext/evolve.py	Sun May 11 01:17:02 2014 -0700
+++ b/hgext/evolve.py	Fri May 09 03:06:36 2014 -0700
@@ -52,6 +52,7 @@
 from mercurial import merge
 from mercurial import node
 from mercurial import phases
+from mercurial import patch
 from mercurial import revset
 from mercurial import scmutil
 from mercurial import templatekw
@@ -823,6 +824,37 @@
      _('record the specified user in metadata'), _('USER')),
 ]
 
+if getattr(mercurial.cmdutil, 'tryimportone', None) is not None:
+    # hg 3.0 and greate
+    @eh.uisetup
+    def _installimportobsolete(ui):
+        entry = cmdutil.findcmd('import', commands.table)[1]
+        entry[1].append(('', 'obsolete', False,
+                        _('mark the old node as obsoleted by'
+                          'the created commit')))
+
+    @eh.wrapfunction(mercurial.cmdutil, 'tryimportone')
+    def tryimportone(orig, ui, repo, hunk, parents, opts, *args, **kwargs):
+        extracted = patch.extract(ui, hunk)
+        expected = extracted[5]
+        oldextract = patch.extract
+        try:
+            patch.extract = lambda ui, hunk: extracted
+            ret = orig(ui, repo, hunk, parents, opts, *args, **kwargs)
+        finally:
+            patch.extract = oldextract
+        created = ret[1]
+        if opts['obsolete'] and created is not None and created != expected:
+                tr = repo.transaction('import-obs')
+                try:
+                    metadata = {'user': ui.username()}
+                    repo.obsstore.create(tr, node.bin(expected), (created,),
+                                         metadata=metadata)
+                    tr.close()
+                finally:
+                    tr.release()
+        return ret
+
 
 @command('^evolve|stabilize|solve',
     [('n', 'dry-run', False, 'do not perform actions, just print what would be done'),