[issue15056] Have imp.cache_from_source() raise NotImplementedError when cache tag not available

[Brett Cannon]

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

I released Pranav's patch and fleshed it out with docs, tests, and changes to importlib's use of cache_from_source().

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resolution:  -> fixed
status: open -> closed

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<http://bugs.python.org/issue15056>
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