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The bpo-29137 removed the fpectl module. But two macros were kept in pyfpe.h:
/* These macros used to do something when Python was built with --with-fpectl,
 * but support for that was dropped in 3.7. We continue to define them though,
 * to avoid breaking API users.
 */
#define PyFPE_START_PROTECT(err_string, leave_stmt)
#define PyFPE_END_PROTECT(v)
I propose to exclude them from the stable API. Maybe at least exclude them from the stable API >= 3.9?
commit 735ae8d139a673b30b321dc10acfd3d14f0d633b
Author: Nathaniel J. Smith <njs@pobox.com>
Date: Fri Jan 5 23:15:34 2018 -0800
 bpo-29137: Remove fpectl module (#4789)
 
 This module has never been enabled by default, never worked correctly
 on x86-64, and caused ABI problems that caused C extension
 compatibility. See bpo-29137 for details/discussion.