diff --git a/contrib/revsetbenchmarks.txt b/contrib/revsetbenchmarks.txt
--- a/contrib/revsetbenchmarks.txt
+++ b/contrib/revsetbenchmarks.txt
@@ -14,3 +14,7 @@ 0::
 min(0::)
 roots((tip~100::) - (tip~100::tip))
 ::p1(p1(tip))::
+public()
+:10000 and public()
+draft()
+:10000 and draft()
diff --git a/mercurial/revset.py b/mercurial/revset.py
--- a/mercurial/revset.py
+++ b/mercurial/revset.py
@@ -2784,8 +2784,9 @@ class spanset(_orderedsetmixin):
                 yield r
 
     def __contains__(self, rev):
-        return self._contained(rev) and not (self._hiddenrevs and rev in
-                self._hiddenrevs)
+        return (((self._end < rev <= self._start)
+                  or (self._start <= rev < self._end))
+                and not (self._hiddenrevs and rev in self._hiddenrevs))
 
     def __nonzero__(self):
         for r in self: