[issue26131] Raise ImportWarning when loader.load_module() is used

[Sviatoslav Sydorenko]

Sviatoslav Sydorenko <svyatoslav at sydorenko.org.ua> added the comment:

> What is "VendorImporter"

@brett.cannon `VendorImporter` is something comping from `pkg_resources`. Because of an entangled traceback and the fact that it dynamically injects a vendored copy of `six`, it's hard to spot. Here's an upstream issue I filed about this warning: https://github.com/pypa/setuptools/issues/2481.

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nosy: +webknjaz

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<https://bugs.python.org/issue26131>
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