[Bug 6850] New: rust: cpython crate is unmaintained and doesn't work with Python 3.12 - switch to pyo3

[mercurial-bugs at mercurial-scm.org]

https://bz.mercurial-scm.org/show_bug.cgi?id=6850

            Bug ID: 6850
           Summary: rust: cpython crate is unmaintained and doesn't work
                    with Python 3.12 - switch to pyo3
           Product: Mercurial
           Version: stable branch
          Hardware: PC
                OS: Linux
            Status: UNCONFIRMED
          Severity: bug
          Priority: wish
         Component: Mercurial
          Assignee: bugzilla at mercurial-scm.org
          Reporter: mads at kiilerich.com
                CC: mercurial-devel at mercurial-scm.org
    Python Version: ---

Summarizing https://bugzilla.redhat.com/show_bug.cgi?id=2249383 :

The "cpython" crate is now officially unmaintained [0], and it does not support
Python 3.12 [1].

c.f.
https://lists.fedoraproject.org/archives/list/devel@lists.fedoraproject.org/thread/XG7GMDZFL2RO4QHEFBJKU7YDE3AZBRVM/#XG7GMDZFL2RO4QHEFBJKU7YDE3AZBRVM

The upstream author of the "cpython" crate recommends to migrate to pyo3.
Versions 0.19.2 and newer of pyo3 support Python 3.12.

[0]: https://github.com/dgrunwald/rust-cpython/commit/e815555
[1]: https://github.com/dgrunwald/rust-cpython/issues/294

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