[issue30389] distutils._msvccompiler cannot find VS 2017

[STINNER Victor]

STINNER Victor added the comment:

I'm pretty sure that the commit 05f01d85257d0f3409c7335aaf0bf6a6da7eecb7 introduced this memory leak:

test_distutils leaked [8736, 8740, 8740] references, sum=26216
test_distutils leaked [8640, 8642, 8642] memory blocks, sum=25924

http://buildbot.python.org/all/builders/AMD64%20Windows8.1%20Refleaks%203.x/builds/99/steps/test/logs/stdio

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nosy: +haypo

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<https://bugs.python.org/issue30389>
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