# HG changeset patch
# User Matt Mackall <mpm@selenic.com>
# Date 1321824595 21600
# Node ID 5edaf47cd462991d074b6624f813575fd0cd2466
# Parent  0810ccc51f0adfc1805fa3ce8113be6f4d7aeed3
revset: follow(nosuchfile) should give an empty set (issue3114)

diff -r 0810ccc51f0a -r 5edaf47cd462 mercurial/revset.py
--- a/mercurial/revset.py	Fri Nov 11 11:11:11 2011 +1111
+++ b/mercurial/revset.py	Sun Nov 20 15:29:55 2011 -0600
@@ -434,7 +434,10 @@
     p = repo['.'].rev()
     if l:
         x = getstring(l[0], _("follow expected a filename"))
-        s = set(ctx.rev() for ctx in repo['.'][x].ancestors())
+        if x in repo['.']:
+            s = set(ctx.rev() for ctx in repo['.'][x].ancestors())
+        else:
+            return []
     else:
         s = set(repo.changelog.ancestors(p))