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

[Eric Snow]

Eric Snow <ericsnowcurrently at gmail.com> added the comment:

Brett meant the implementation would set it.  You'd still expect it to not change values during the execution of the interpreter.  I suppose anyone could change that value, but I'd see that more as a consenting adults situation.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue15056>
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