Crash when analyzing f-strings

[refi64]

ryan@DevPC-LX /media/ryan/stuff/pytype master $ cat x.py
print(f'{a}')
ryan@DevPC-LX /media/ryan/stuff/pytype master $ pytype -V 3.6 x.py
Traceback (most recent call last):
  File "/usr/local/bin/pytype", line 272, in <module>
    sys.exit(main(sys.argv) or 0)
  File "/usr/local/bin/pytype", line 224, in main
    return _run_pytype(options)
  File "/usr/local/bin/pytype", line 265, in _run_pytype
    errors_csv_file=errors_csv_file)
  File "/usr/local/bin/pytype", line 172, in process_one_file
    options=options)
  File "/usr/local/bin/pytype", line 52, in check_pyi
    cache_unknowns=options.cache_unknowns)
  File "/usr/local/lib/python2.7/dist-packages/pytype/infer.py", line 585, in check_types
    py_src, py_filename, init_maximum_depth, run_builtins)
  File "/usr/local/lib/python2.7/dist-packages/pytype/vm.py", line 544, in run_program
    node, f_globals, f_locals, builtin_names = self.preload_builtins(node)
  File "/usr/local/lib/python2.7/dist-packages/pytype/vm.py", line 514, in preload_builtins
    builtins_code = self.compile_src(src)
  File "/usr/local/lib/python2.7/dist-packages/pytype/vm.py", line 499, in compile_src
    filename=filename, mode=mode)
  File "/usr/local/lib/python2.7/dist-packages/pytype/pyc/pyc.py", line 139, in compile_src
    code = parse_pyc_string(pyc_data)
  File "/usr/local/lib/python2.7/dist-packages/pytype/pyc/pyc.py", line 110, in parse_pyc_string
    return parse_pyc_stream(StringIO.StringIO(data))
  File "/usr/local/lib/python2.7/dist-packages/pytype/pyc/pyc.py", line 90, in parse_pyc_stream
    python_version = magic.magic_word_to_version(magic_word)
  File "/usr/local/lib/python2.7/dist-packages/pytype/pyc/magic.py", line 105, in magic_word_to_version
    return PYTHON_MAGIC[magic_word]
KeyError: 3377
ryan@DevPC-LX /media/ryan/stuff/pytype master $ 

[matthiaskramm]

Yeah, looks like pytype isn't even aware of Python 3.6 yet. It crashes when reading out the version number.