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Hi Stephen.  I don't understand why 'path' has to be
non-null.  Not only that, but if it *is* null and the module
has no __path__, your patch is still going to pass in a null
path.  So I'm confused.  How did you discover the problem?

Similarly, I'm confused as to why 'mod=reload(mod)' would be
necessary now, but wasn't before.  There have been no
changes that I see in test_importhooks that would cause
that.  What was your testing methodology for this?