code: def test_tokenizer_fstring_warning_in_first_line(self):
      source = "0b1and 2"
      with open(TESTFN, "w") as fd:
          fd.write("{}".format(source))
      try:
          retcode, stdout, stderr = script_helper.assert_python_ok(
              TESTFN
          )
          self.assertIn(b"SyntaxWarning: invalid binary litera", stderr)
          self.assertEqual(stderr.count(source.encode()), 1)
      finally:
          os.unlink(TESTFN)
  
imports: import unittest
  from test.support import script_helper, captured_stdout, requires_subprocess, requires_resource
  from test.support.os_helper import TESTFN, unlink, rmtree
  from test.support.import_helper import unload
  import importlib
  import os
  import sys
  import subprocess
  import tempfile
label_desc: Use image node_id 16 for calling the MiscSourceEncodingTest obj's underlying member method code with example usage: obj.test_tokenizer_fstring_warning_in_first_line() without return types