diff -r aea06029919e -r 0b8356705de6 mercurial/scmutil.py
--- a/mercurial/scmutil.py	Sun Feb 19 18:16:09 2017 +0900
+++ b/mercurial/scmutil.py	Sun Feb 19 18:19:33 2017 +0900
@@ -30,6 +30,7 @@
     phases,
     pycompat,
     revset,
+    revsetlang,
     similar,
     util,
 )
@@ -890,7 +891,7 @@
     return repo[l.last()]
 
 def _pairspec(revspec):
-    tree = revset.parse(revspec)
+    tree = revsetlang.parse(revspec)
     return tree and tree[0] in ('range', 'rangepre', 'rangepost', 'rangeall')
 
 def revpair(repo, revs):
@@ -936,7 +937,7 @@
     revision numbers.
 
     It is assumed the revsets are already formatted. If you have arguments
-    that need to be expanded in the revset, call ``revset.formatspec()``
+    that need to be expanded in the revset, call ``revsetlang.formatspec()``
     and pass the result as an element of ``specs``.
 
     Specifying a single revset is allowed.
@@ -947,7 +948,7 @@
     allspecs = []
     for spec in specs:
         if isinstance(spec, int):
-            spec = revset.formatspec('rev(%d)', spec)
+            spec = revsetlang.formatspec('rev(%d)', spec)
         allspecs.append(spec)
     m = revset.matchany(repo.ui, allspecs, repo)
     return m(repo)