[docs] [issue29973] Travis CI docs broken: UnboundLocalError: local variable 'prefix' referenced before assignment

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

This already is fixed in mainstream. https://github.com/sphinx-doc/sphinx/issues/3597

Sphinx 1.5.5 will be released soon. https://github.com/sphinx-doc/sphinx/issues/3598

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nosy: +serhiy.storchaka

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