diff -r 1ff45c518e6f -r 61ab546b71c3 mercurial/filesetlang.py
--- a/mercurial/filesetlang.py	Sat Aug 04 17:17:31 2018 +0900
+++ b/mercurial/filesetlang.py	Sat Aug 04 17:08:33 2018 +0900
@@ -14,6 +14,13 @@
     pycompat,
 )
 
+# common weight constants for static optimization
+# (see registrar.filesetpredicate for details)
+WEIGHT_CHECK_FILENAME = 0.5
+WEIGHT_READ_CONTENTS = 30
+WEIGHT_STATUS = 10
+WEIGHT_STATUS_THOROUGH = 50
+
 elements = {
     # token-type: binding-strength, primary, prefix, infix, suffix
     "(": (20, None, ("group", 1, ")"), ("func", 1, ")"), None),
@@ -184,7 +191,7 @@
 
     op = x[0]
     if op in {'string', 'symbol'}:
-        return 0.5, x
+        return WEIGHT_CHECK_FILENAME, x
     if op == 'kindpat':
         w, t = _optimize(x[2])
         return w, (op, x[1], t)