diff -r 039a964dbbb3 -r a98a90023261 mercurial/localrepo.py
--- a/mercurial/localrepo.py	Fri Dec 10 15:14:05 2010 +0100
+++ b/mercurial/localrepo.py	Fri Dec 10 16:10:14 2010 +0100
@@ -629,10 +629,6 @@
 
     def wwrite(self, filename, data, flags):
         data = self._filter(self._decodefilterpats, filename, data)
-        try:
-            os.unlink(self.wjoin(filename))
-        except OSError:
-            pass
         if 'l' in flags:
             self.wopener.symlink(data, filename)
         else: