Guido van Rossum 95e4d58913 String annotations [PEP 563] (#4390) ...

* Document `from __future__ import annotations`
* Provide plumbing and tests for `from __future__ import annotations`
* Implement unparsing the AST back to string form

This is required for PEP 563 and as such only implements a part of the
unparsing process that covers expressions.

2018-01-26 08:20:18 -08:00

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