Commits on Feb 9, 2024

1. track if typing.TYPE_CHECKING to warn about non runtime bindings …

   When importing or defining values in ``if typing.TYPE_CHECKING`` blocks
   the bound names will not be available at runtime and may cause errors
   when used in the following way::
   
     import typing
   
     if typing.TYPE_CHECKING:
       from module import Type  # some slow import or circular reference
   
     def method(value) -> Type:  # the import is needed by the type checker
       assert isinstance(value, Type)  # this is a runtime error
   
   This change allows pyflakes to track what names are bound for runtime
   use, and allows it to warn when a non runtime name is used in a runtime
   context.

   

   terencehonles committed Feb 9, 2024
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