typed-ast has been EOL-ed

[sajith]

Seems that this dependency is a source of trouble, and probably even unnecessary. According to typed-ast's README:

typed_ast will not be updated to support parsing Python 3.8 and newer. Instead, it is recommended to use the stdlib ast module there, which has been augmented to support extracting type comments and has limited support for parsing older versions of Python 3.

Also see https://github.com/python/typed_ast/issues/179.

Unless Python 2 support is important for some reason, can we remove typed-ast requirement?

I tried to do a pip install -r requirements.txt, and typed-ast couldn't even be installed in a venv on a M1 MacBook, when using Python 3.9.13:

      clang -Wno-unused-result -Wsign-compare -Wunreachable-code -fno-common -dynamic -DNDEBUG -g -fwrapv -O3 -Wall -isysroot /Library/Developer/CommandLineTools/SDKs/MacOSX12.sdk -Iast3/Include -I/opt/homebrew/opt/python@3.9/Frameworks/Python.framework/Versions/3.9/include/python3.9 -c ast3/Python/ast.c -o build/temp.macosx-12-arm64-cpython-39/ast3/Python/ast.o
      ast3/Python/ast.c:844:5: warning: code will never be executed [-Wunreachable-code]
          abort();
          ^~~~~
      ast3/Python/ast.c:4514:9: error: implicit declaration of function '_PyUnicode_DecodeUnicodeEscape' is invalid in C99 [-Werror,-Wimplicit-function-declaration]
          v = _PyUnicode_DecodeUnicodeEscape(s, len, NULL, &first_invalid_escape);
              ^
      ast3/Python/ast.c:4514:9: note: did you mean 'PyUnicode_DecodeUnicodeEscape'?
      /opt/homebrew/opt/python@3.9/Frameworks/Python.framework/Versions/3.9/include/python3.9/unicodeobject.h:588:23: note: 'PyUnicode_DecodeUnicodeEscape' declared here
      PyAPI_FUNC(PyObject*) PyUnicode_DecodeUnicodeEscape(
                            ^
      ast3/Python/ast.c:4514:7: warning: incompatible integer to pointer conversion assigning to 'PyObject *' (aka 'struct _object *') from 'int' [-Wint-conversion]
          v = _PyUnicode_DecodeUnicodeEscape(s, len, NULL, &first_invalid_escape);
            ^ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
      2 warnings and 1 error generated.
      error: command '/usr/bin/clang' failed with exit code 1
      [end of output]

  note: This error originates from a subprocess, and is likely not a problem with pip.
error: legacy-install-failure

× Encountered error while trying to install package.
╰─> typed-ast

[ibaldin]

good catch, will appear in 1.4