.

wcfs/wcfs_test.py

@@ -635,7 +635,13 @@ def watch(w, zf, at):   # XXX -> ?
 
     # pinstr returns human-readable representation for {}blk->rev
     def pinstr(pin):
-        pinv = ['%d: %s' % (blk, t.hat(pin[blk])) for blk in sorted(pin.keys())]
+        pinv = []
+        for blk in sorted(pin.keys()):
+            if pin[blk] is None:
+                s = 'head'
+            else:
+                s = t.hat(pin[blk])
+            pinv.append('%d: %s' % (blk, s))
         return '{%s}' % ', '.join(pinv)