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-rw-r--r--Doc/using/cmdline.rst4
1 files changed, 3 insertions, 1 deletions
diff --git a/Doc/using/cmdline.rst b/Doc/using/cmdline.rst
index bd3cdef..0574336 100644
--- a/Doc/using/cmdline.rst
+++ b/Doc/using/cmdline.rst
@@ -437,6 +437,7 @@ Miscellaneous options
* Enable :ref:`asyncio debug mode <asyncio-debug-mode>`.
* Set the :attr:`~sys.flags.dev_mode` attribute of :attr:`sys.flags` to
``True``
+ * :class:`io.IOBase` destructor logs ``close()`` exceptions.
* ``-X utf8`` enables UTF-8 mode for operating system interfaces, overriding
the default locale-aware mode. ``-X utf8=0`` explicitly disables UTF-8
@@ -465,7 +466,8 @@ Miscellaneous options
The ``-X importtime``, ``-X dev`` and ``-X utf8`` options.
.. versionadded:: 3.8
- The ``-X pycache_prefix`` option.
+ The ``-X pycache_prefix`` option. The ``-X dev`` option now logs
+ ``close()`` exceptions in :class:`io.IOBase` destructor.
Options you shouldn't use