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

[Petri Lehtinen]

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

Should the component really be extension modules? I don't believe _sre.c is a part of the API, and the problem is embedding Python as a whole.

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<http://bugs.python.org/issue12604>
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