[issue4304] build mode which fails for build failures in extensions

[Petr Viktorin]

Petr Viktorin <encukou at gmail.com> added the comment:

This would be nice.
Too often when hacking on an extension, test pass just because I don't notice there was a compile error and so I'm testing an older version.

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nosy: +petr.viktorin

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<https://bugs.python.org/issue4304>
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