[Python-checkins] [3.7] bpo-36985: Document typing.ForwardRef (GH-14216) (GH-14220)

[Miss Islington (bot)]

https://github.com/python/cpython/commit/d0587353fe2dece91d2a9b8ddf2696fb5adc233a
commit: d0587353fe2dece91d2a9b8ddf2696fb5adc233a
branch: 3.7
author: Ivan Levkivskyi <levkivskyi at gmail.com>
committer: Miss Islington (bot) <31488909+miss-islington at users.noreply.github.com>
date: 2019-06-18T18:02:15-07:00
summary:

[3.7] bpo-36985: Document typing.ForwardRef (GH-14216) (GH-14220)



https://bugs.python.org/issue36985

files:
M Doc/library/typing.rst

diff --git a/Doc/library/typing.rst b/Doc/library/typing.rst
index 12f4c03f4232..5adc81c1e3c8 100644
--- a/Doc/library/typing.rst
+++ b/Doc/library/typing.rst
@@ -876,6 +876,13 @@ The module defines the following classes, functions and decorators:
    .. versionchanged:: 3.6.1
       Added support for default values, methods, and docstrings.
 
+.. class:: ForwardRef
+
+   A class used for internal typing representation of string forward references.
+   For example, ``List["SomeClass"]`` is implicitly transformed into
+   ``List[ForwardRef("SomeClass")]``.  This class should not be instantiated by
+   a user, but may be used by introspection tools.
+
 .. function:: NewType(typ)
 
    A helper function to indicate a distinct types to a typechecker,