(cherry picked from commit d160e0f8e283d0a8737644588b38e8c6a07c134f)

Co-authored-by: tkmikan <36260601+tkmikan@users.noreply.github.com>

gcc -Wcast-qual turns up a number of instances of casting away constness of pointers. Some of these can be safely modified, by either:

Adding the const to the type cast, as in:

-    return _PyUnicode_FromUCS1((unsigned char*)s, size);
+    return _PyUnicode_FromUCS1((const unsigned char*)s, size);

or, Removing the cast entirely, because it's not necessary (but probably was at one time), as in:

-    PyDTrace_FUNCTION_ENTRY((char *)filename, (char *)funcname, lineno);
+    PyDTrace_FUNCTION_ENTRY(filename, funcname, lineno);

These changes will not change code, but they will make it much easier to check for errors in consts
(cherry picked from commit e6be9b59a911626d6597fe148c32f0342bd2bd24)

Co-authored-by: Andy Lester <andy@petdance.com>

(cherry picked from commit 33b671e72450bf4b5a946ce0dde6b7fe21150108)

Co-authored-by: Brandt Bucher <brandtbucher@gmail.com>

Add PyCode_NewEx to be used internally and set PyCode_New as a compatibility wrapper
(cherry picked from commit 4a2edc34a405150d0b23ecfdcb401e7cf59f4650)

Co-authored-by: Pablo Galindo <Pablogsal@gmail.com>

This commit contains the implementation of PEP570: Python positional-only parameters.

* Update Grammar/Grammar with new typedarglist and varargslist

* Regenerate grammar files

* Update and regenerate AST related files

* Update code object

* Update marshal.c

* Update compiler and symtable

* Regenerate importlib files

* Update callable objects

* Implement positional-only args logic in ceval.c

* Regenerate frozen data

* Update standard library to account for positional-only args

* Add test file for positional-only args

* Update other test files to account for positional-only args

* Add News entry

* Update inspect module and related tests

Set MemoryError when appropriate, add missing failure checks,
and fix some potential leaks.

Simplify the reverted code.

This reverts commit e9bbe8b87ba2874efba0474af5cc7d5941dbf742.