diff -r 8d6909ab6844 Lib/importlib/test/source/test_abc_loader.py
--- a/Lib/importlib/test/source/test_abc_loader.py	Tue Jun 05 16:48:38 2012 +0100
+++ b/Lib/importlib/test/source/test_abc_loader.py	Thu Jun 07 18:32:21 2012 +0100
@@ -457,6 +457,22 @@
         mtime = importlib._r_long(mock.module_bytecode[name][4:8])
         self.assertEqual(mtime, PyPycLoaderMock.default_mtime)
 
+    @source_util.writes_bytecode_files
+    def test_pyc_compatibility(self):
+        name = 'foo'
+        with source_util.create_modules(name) as fpath:
+            loader = importlib.machinery.SourceFileLoader(name, fpath[name])
+            module = loader.load_module(name)
+            bytecode_path = module.__cached__
+            with open(bytecode_path, 'rb') as f:
+                cached_data = f.read()
+            mock = PyPycLoaderMock({name: fpath[name]},
+                                            {name: {'path': bytecode_path}})
+            mock.module_bytecode[name] = cached_data
+            del sys.modules[name]
+            mock.load_module(name)
+            self.assertEqual(mock.module_bytecode[name], cached_data)
+
 
 class BadBytecodeFailureTests(unittest.TestCase):