[issue38150] test_capi: test_c_subclass_of_heap_ctype_with_del_modifying_dunder_class_only_decrefs_once() leaks

[STINNER Victor]

STINNER Victor <vstinner at python.org> added the comment:

The new test was added by:

commit ff023ed36ea260ab64be5895f1f1f087c798987a
Author: Eddie Elizondo <eduardo.elizondorueda at gmail.com>
Date:   Wed Sep 11 05:17:13 2019 -0400

    bpo-37879: Suppress subtype_dealloc decref when base type is a C heap type (GH-15323)

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<https://bugs.python.org/issue38150>
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