diff --git a/Lib/lib2to3/patcomp.py b/Lib/lib2to3/patcomp.py
index bb538d5..0a259e9 100644
--- a/Lib/lib2to3/patcomp.py
+++ b/Lib/lib2to3/patcomp.py
@@ -11,6 +11,7 @@
 __author__ = "Guido van Rossum <guido@python.org>"
 
 # Python imports
+import io
 import os
 
 # Fairly local imports
@@ -32,7 +33,7 @@
 def tokenize_wrapper(input):
     """Tokenizes a string suppressing significant whitespace."""
     skip = set((token.NEWLINE, token.INDENT, token.DEDENT))
-    tokens = tokenize.generate_tokens(driver.generate_lines(input).__next__)
+    tokens = tokenize.generate_tokens(io.StringIO(input).readline)
     for quintuple in tokens:
         type, value, start, end, line_text = quintuple
         if type not in skip:
diff --git a/Lib/lib2to3/pgen2/driver.py b/Lib/lib2to3/pgen2/driver.py
index ee77a13..e7828ff 100644
--- a/Lib/lib2to3/pgen2/driver.py
+++ b/Lib/lib2to3/pgen2/driver.py
@@ -17,6 +17,7 @@
 
 # Python imports
 import codecs
+import io
 import os
 import logging
 import sys
@@ -101,18 +102,10 @@
 
     def parse_string(self, text, debug=False):
         """Parse a string and return the syntax tree."""
-        tokens = tokenize.generate_tokens(generate_lines(text).__next__)
+        tokens = tokenize.generate_tokens(io.StringIO(text).readline)
         return self.parse_tokens(tokens, debug)
 
 
-def generate_lines(text):
-    """Generator that behaves like readline without using StringIO."""
-    for line in text.splitlines(True):
-        yield line
-    while True:
-        yield ""
-
-
 def load_grammar(gt="Grammar.txt", gp=None,
                  save=True, force=False, logger=None):
     """Load the grammar (maybe from a pickle)."""
diff --git a/Lib/lib2to3/tests/test_parser.py b/Lib/lib2to3/tests/test_parser.py
index ce39e41..f32404c 100644
--- a/Lib/lib2to3/tests/test_parser.py
+++ b/Lib/lib2to3/tests/test_parser.py
@@ -14,10 +14,21 @@
 
 # Python imports
 import os
+import unittest
 
 # Local imports
 from lib2to3.pgen2 import tokenize
 from ..pgen2.parse import ParseError
+from lib2to3.pygram import python_symbols as syms
+
+
+class TestDriver(support.TestCase):
+
+    def test_formfeed(self):
+        s = """print 1\n\x0Cprint 2\n"""
+        t = driver.parse_string(s)
+        self.assertEqual(t.children[0].children[0].type, syms.print_stmt)
+        self.assertEqual(t.children[1].children[0].type, syms.print_stmt)
 
 
 class GrammarTest(support.TestCase):
@@ -147,19 +158,22 @@
 
     """A cut-down version of pytree_idempotency.py."""
 
+    # Issue 13125
+    @unittest.expectedFailure
     def test_all_project_files(self):
         for filepath in support.all_project_files():
             with open(filepath, "rb") as fp:
                 encoding = tokenize.detect_encoding(fp.readline)[0]
             self.assertTrue(encoding is not None,
                             "can't detect encoding for %s" % filepath)
-            with open(filepath, "r") as fp:
+            with open(filepath, "r", encoding=encoding) as fp:
                 source = fp.read()
-                source = source.decode(encoding)
-            tree = driver.parse_string(source)
+            try:
+                tree = driver.parse_string(source)
+            except ParseError as err:
+                print('ParseError on file', filepath, err)
+                continue
             new = str(tree)
-            if encoding:
-                new = new.encode(encoding)
             if diff(filepath, new):
                 self.fail("Idempotency failed: %s" % filepath)
 
@@ -202,14 +216,14 @@
         self.validate(s)
 
 
-def diff(fn, result, encoding):
-    f = open("@", "w")
+def diff(fn, result):
     try:
-        f.write(result.encode(encoding))
-    finally:
-        f.close()
-    try:
+        with open('@', 'w') as f:
+            f.write(str(result))
         fn = fn.replace('"', '\\"')
         return os.system('diff -u "%s" @' % fn)
     finally:
-        os.remove("@")
+        try:
+            os.remove("@")
+        except OSError:
+            pass
diff --git a/Lib/test/test_lib2to3.py b/Lib/test/test_lib2to3.py
index 0d6f9a3..1afaf70 100644
--- a/Lib/test/test_lib2to3.py
+++ b/Lib/test/test_lib2to3.py
@@ -1,6 +1,7 @@
 # Skipping test_parser and test_all_fixers
 # because of running
 from lib2to3.tests import (test_fixers, test_pytree, test_util, test_refactor,
+                           test_parser,
                            test_main as test_main_)
 import unittest
 from test.support import run_unittest
@@ -9,7 +10,7 @@
     tests = unittest.TestSuite()
     loader = unittest.TestLoader()
     for m in (test_fixers, test_pytree,test_util, test_refactor,
-              test_main_):
+              test_parser, test_main_):
         tests.addTests(loader.loadTestsFromModule(m))
     return tests
 
diff --git a/Misc/NEWS b/Misc/NEWS
index 44435fe..f49097d 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -39,6 +39,10 @@
 Library
 -------
 
+- Issue #11250: Back port fix from 3.3 branch, so that 2to3 can handle files
+  with line feeds.  This was ported from the sandbox to the 3.3 branch, but
+  didn't make it into 3.2.
+
 - Issue #7367: Fix pkgutil.walk_paths to skip directories whose
   contents cannot be read.
 
@@ -101,6 +105,9 @@
 
 - Issue #12821: Fix test_fcntl failures on OpenBSD 5.
 
+- Re-enable lib2to3's test_parser.py tests, though with an expected failure
+  (see issue 13125).
+
 Extension Modules
 -----------------