[issue25571] Improve the lltrace feature with the Py_Debug mode

[Stéphane Wirtel]

Changes by Stéphane Wirtel <stephane at wirtel.be>:


----------
components: +Interpreter Core
versions: +Python 3.6

_______________________________________
Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue25571>
_______________________________________