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[3.9] bpo-40928: notify users running test_decimal on macOS of malloc warnings (GH-26783) (GH-27629)

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* When trying to allocate very large regions on macOS, malloc does not   fail silently. It sends a noisy error out to STDERR
* This provides a helper function to warn the user, and provides the warning for test_decimal, which consistently generates these warnings on macOS.

Co-authored-by: Łukasz Langa <lukasz@langa.pl>.
(cherry picked from commit 15d3c14df3)

Co-authored-by: Jack DeVries <58614260+jdevries3133@users.noreply.github.com>
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Łukasz Langa 2021-08-06 15:35:11 +02:00 • committed by GitHub
parent 7dad033751
commit 693a661478
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3 changed files with 27 additions and 1 deletions
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7
Lib/test/test_decimal.py
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@ -35,12 +35,17 @@ import locale
from test.support import (run_unittest, run_doctest, is_resource_enabled,
requires_IEEE_754, requires_docstrings)
from test.support import (import_fresh_module, TestFailed,
run_with_locale, cpython_only)
run_with_locale, cpython_only,
darwin_malloc_err_warning)
import random
import inspect
import threading
if sys.platform == 'darwin':
darwin_malloc_err_warning('test_decimal')
C = import_fresh_module('decimal', fresh=['_decimal'])
P = import_fresh_module('decimal', blocked=['_decimal'])
orig_sys_decimal = sys.modules['decimal']