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

[Brett Cannon]

Brett Cannon <brett at python.org> added the comment:

A PR is now up. I ended up deprecating the load_module() methods in importlib itself and then raise ImportWarning in the import system itself when falling back to load_module().

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stage: patch review -> test needed

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue26131>
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