diff -r 2af0156cebaa -r a84fc98a8af5 contrib/hgfixes/fix_leftover_imports.py
--- a/contrib/hgfixes/fix_leftover_imports.py	Sat Feb 27 21:14:17 2016 -0800
+++ /dev/null	Thu Jan 01 00:00:00 1970 +0000
@@ -1,107 +0,0 @@
-"Fixer that translates some APIs ignored by the default 2to3 fixers."
-
-# FIXME: This fixer has some ugly hacks. Its main design is based on that of
-# fix_imports, from lib2to3. Unfortunately, the fix_imports framework only
-# changes module names "without dots", meaning it won't work for some changes
-# in the email module/package. Thus this fixer was born. I believe that with a
-# bit more thinking, a more generic fixer can be implemented, but I'll leave
-# that as future work.
-
-from lib2to3.fixer_util import Name
-from lib2to3.fixes import fix_imports
-
-# This maps the old names to the new names. Note that a drawback of the current
-# design is that the dictionary keys MUST have EXACTLY one dot (.) in them,
-# otherwise things will break. (If you don't need a module hierarchy, you're
-# better of just inherit from fix_imports and overriding the MAPPING dict.)
-
-MAPPING = {'email.Utils': 'email.utils',
-           'email.Errors': 'email.errors',
-           'email.Header': 'email.header',
-           'email.Parser': 'email.parser',
-           'email.Encoders': 'email.encoders',
-           'email.MIMEText': 'email.mime.text',
-           'email.MIMEBase': 'email.mime.base',
-           'email.Generator': 'email.generator',
-           'email.MIMEMultipart': 'email.mime.multipart',
-}
-
-def alternates(members):
-    return "(" + "|".join(map(repr, members)) + ")"
-
-def build_pattern(mapping=MAPPING):
-    packages = {}
-    for key in mapping:
-        # What we are doing here is the following: with dotted names, we'll
-        # have something like package_name <trailer '.' module>. Then, we are
-        # making a dictionary to copy this structure. For example, if
-        # mapping={'A.B': 'a.b', 'A.C': 'a.c'}, it will generate the dictionary
-        # {'A': ['b', 'c']} to, then, generate something like "A <trailer '.'
-        # ('b' | 'c')".
-        name = key.split('.')
-        prefix = name[0]
-        if prefix in packages:
-            packages[prefix].append(name[1:][0])
-        else:
-            packages[prefix] = name[1:]
-
-    mod_list = ' | '.join(["'%s' '.' ('%s')" %
-        (key, "' | '".join(packages[key])) for key in packages])
-    mod_list = '(' + mod_list + ' )'
-
-    yield """name_import=import_name< 'import' module_name=dotted_name< %s > >
-          """ % mod_list
-
-    yield """name_import=import_name< 'import'
-            multiple_imports=dotted_as_names< any*
-            module_name=dotted_name< %s >
-            any* >
-            >""" % mod_list
-
-    packs = ' | '.join(["'%s' trailer<'.' ('%s')>" % (key,
-               "' | '".join(packages[key])) for key in packages])
-
-    yield "power< package=(%s) trailer<'.' any > any* >" % packs
-
-class FixLeftoverImports(fix_imports.FixImports):
-    # We want to run this fixer after fix_import has run (this shouldn't matter
-    # for hg, though, as setup3k prefers to run the default fixers first)
-    mapping = MAPPING
-
-    def build_pattern(self):
-        return "|".join(build_pattern(self.mapping))
-
-    def transform(self, node, results):
-        # Mostly copied from fix_imports.py
-        import_mod = results.get("module_name")
-        if import_mod:
-            try:
-                mod_name = import_mod.value
-            except AttributeError:
-                # XXX: A hack to remove whitespace prefixes and suffixes
-                mod_name = str(import_mod).strip()
-            new_name = self.mapping[mod_name]
-            import_mod.replace(Name(new_name, prefix=import_mod.prefix))
-            if "name_import" in results:
-                # If it's not a "from x import x, y" or "import x as y" import,
-                # marked its usage to be replaced.
-                self.replace[mod_name] = new_name
-            if "multiple_imports" in results:
-                # This is a nasty hack to fix multiple imports on a line (e.g.,
-                # "import StringIO, urlparse"). The problem is that I can't
-                # figure out an easy way to make a pattern recognize the keys of
-                # MAPPING randomly sprinkled in an import statement.
-                results = self.match(node)
-                if results:
-                    self.transform(node, results)
-        else:
-            # Replace usage of the module.
-            # Now this is, mostly, a hack
-            bare_name = results["package"][0]
-            bare_name_text = ''.join(map(str, results['package'])).strip()
-            new_name = self.replace.get(bare_name_text)
-            prefix = results['package'][0].prefix
-            if new_name:
-                bare_name.replace(Name(new_name, prefix=prefix))
-                results["package"][1].replace(Name(''))
-