[PATCH] diff: make diff -c aware of revision sets

[steve at borho.org]

# HG changeset patch
# User Steve Borho <steve at borho.org>
# Date 1300126286 18000
# Node ID 10b27553c6734ddf401a03c2a965660b9c07adab
# Parent  fac040b7e82277b765dfeb46561e130f8c63ed3e
diff: make diff -c aware of revision sets

diff -r fac040b7e822 -r 10b27553c673 mercurial/commands.py
--- a/mercurial/commands.py
+++ b/mercurial/commands.py
@@ -1595,7 +1595,7 @@
         msg = _('cannot specify --rev and --change at the same time')
         raise util.Abort(msg)
     elif change:
-        node2 = repo.lookup(change)
+        node2 = cmdutil.revsingle(repo, change, None).node()
         node1 = repo[node2].parents()[0].node()
     else:
         node1, node2 = cmdutil.revpair(repo, revs)