[issue12604] VTRACE macro in _sre.c should use do {} while (0)

[Petri Lehtinen]

Petri Lehtinen <petri at digip.org> added the comment:

Éric Araujo wrote:
> _sre is a module written in C, not Python; we call that an extension
> module. The Library component is used for Python modules, which are
> found in the Lib directory in a checkout of CPython. See #12711.

Ok, I wasn't aware of this. Thanks.

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