diff --git a/Lib/tabnanny.py b/Lib/tabnanny.py
old mode 100755
new mode 100644
index d06c4c221..c0097351b
--- a/Lib/tabnanny.py
+++ b/Lib/tabnanny.py
@@ -1,5 +1,3 @@
-#! /usr/bin/env python3
-
 """The Tab Nanny despises ambiguous indentation.  She knows no mercy.
 
 tabnanny -- Detection of ambiguous indentation
diff --git a/Lib/test/test_tabnanny.py b/Lib/test/test_tabnanny.py
index aa71166a3..4ac018cc8 100644
--- a/Lib/test/test_tabnanny.py
+++ b/Lib/test/test_tabnanny.py
@@ -217,8 +217,7 @@ class TestCheck(TestCase):
             with self.assertRaises(SystemExit):
                 self.verify_tabnanny_check(file_path, err=err)
 
-    # TODO: RUSTPYTHON
-    @unittest.expectedFailure
+    @unittest.expectedFailure  # TODO: RUSTPYTHON; A python source code file eligible for raising `tabnanny.NannyNag`.
     def test_when_nannynag_error_verbose(self):
         """A python source code file eligible for raising `tabnanny.NannyNag`.
 
@@ -232,8 +231,7 @@ class TestCheck(TestCase):
             tabnanny.verbose = 1
             self.verify_tabnanny_check(file_path, out=out)
 
-    # TODO: RUSTPYTHON
-    @unittest.expectedFailure
+    @unittest.expectedFailure  # TODO: RUSTPYTHON; A python source code file eligible for raising `tabnanny.NannyNag`.
     def test_when_nannynag_error(self):
         """A python source code file eligible for raising `tabnanny.NannyNag`."""
         with TemporaryPyFile(SOURCE_CODES["nannynag_errored"]) as file_path:
@@ -318,8 +316,7 @@ class TestCommandLine(TestCase):
             self.assertListEqual(out.splitlines(), stdout.splitlines())
             self.assertListEqual(err.splitlines(), stderr.splitlines())
 
-    # TODO: RUSTPYTHON
-    @unittest.expectedFailure
+    @unittest.expectedFailure  # TODO: RUSTPYTHON; Should displays error when errored python file is given.
     def test_with_errored_file(self):
         """Should displays error when errored python file is given."""
         with TemporaryPyFile(SOURCE_CODES["wrong_indented"]) as file_path:
@@ -345,8 +342,7 @@ class TestCommandLine(TestCase):
             stdout = f"{file_path}\n"
             self.validate_cmd("-q", file_path, stdout=stdout)
 
-    # TODO: RUSTPYTHON
-    @unittest.expectedFailure
+    @unittest.expectedFailure  # TODO: RUSTPYTHON
     def test_verbose_mode(self):
         """Should display more error information if verbose mode is on."""
         with TemporaryPyFile(SOURCE_CODES["nannynag_errored"]) as path:
@@ -355,8 +351,7 @@ class TestCommandLine(TestCase):
             ).strip()
             self.validate_cmd("-v", path, stdout=stdout, partial=True)
 
-    # TODO: RUSTPYTHON
-    @unittest.expectedFailure
+    @unittest.expectedFailure  # TODO: RUSTPYTHON
     def test_double_verbose_mode(self):
         """Should display detailed error information if double verbose is on."""
         with TemporaryPyFile(SOURCE_CODES["nannynag_errored"]) as path: