diff -r 526255fe7899 -r 3c84591e7321 mercurial/match.py
--- a/mercurial/match.py	Thu Jul 06 16:01:36 2017 -0700
+++ b/mercurial/match.py	Thu Jul 06 17:39:24 2017 -0700
@@ -641,6 +641,59 @@
         return ('<subdirmatcher path=%r, matcher=%r>' %
                 (self._path, self._matcher))
 
+class forceincludematcher(basematcher):
+    """A matcher that returns true for any of the forced includes before testing
+    against the actual matcher."""
+    def __init__(self, matcher, includes):
+        self._matcher = matcher
+        self._includes = includes
+
+    def __call__(self, value):
+        return value in self._includes or self._matcher(value)
+
+    def anypats(self):
+        return True
+
+    def prefix(self):
+        return False
+
+    def __repr__(self):
+        return ('<forceincludematcher matcher=%r, includes=%r>' %
+                (self._matcher, sorted(self._includes)))
+
+class unionmatcher(basematcher):
+    """A matcher that is the union of several matchers."""
+    def __init__(self, matchers):
+        self._matchers = matchers
+
+    def __call__(self, value):
+        for match in self._matchers:
+            if match(value):
+                return True
+        return False
+
+    def anypats(self):
+        return True
+
+    def prefix(self):
+        return False
+
+    def __repr__(self):
+        return ('<unionmatcher matchers=%r>' % self._matchers)
+
+class negatematcher(basematcher):
+    def __init__(self, matcher):
+        self._matcher = matcher
+
+    def __call__(self, value):
+        return not self._matcher(value)
+
+    def anypats(self):
+        return True
+
+    def __repr__(self):
+        return ('<negatematcher matcher=%r>' % self._matcher)
+
 def patkind(pattern, default=None):
     '''If pattern is 'kind:pat' with a known kind, return kind.'''
     return _patsplit(pattern, default)[0]