--- a/mercurial/fileset.py	Wed May 06 10:17:41 2015 +0900
+++ b/mercurial/fileset.py	Sun Apr 26 22:26:44 2015 +0900
@@ -517,5 +517,8 @@
 
     return getset(matchctx(ctx, subset, status), tree)
 
+def prettyformat(tree):
+    return parser.prettyformat(tree, ('string', 'symbol'))
+
 # tell hggettext to extract docstrings from these functions:
 i18nfunctions = symbols.values()