[3.12] gh-118418: Use a default value for type_params in typing._eval_type (GH-118431) (#118436)

Co-authored-by: Nikita Sobolev <mail@sobolevn.me>

Author: miss-islington

Lib/typing.py

@@ -404,7 +404,7 @@ def inner(*args, **kwds):
     return decorator
 
 
-def _eval_type(t, globalns, localns, type_params, *, recursive_guard=frozenset()):
+def _eval_type(t, globalns, localns, type_params=None, *, recursive_guard=frozenset()):
     """Evaluate all forward references in the given type t.
 
     For use of globalns and localns see the docstring for get_type_hints().
@@ -913,7 +913,7 @@ def __init__(self, arg, is_argument=True, module=None, *, is_class=False):
         self.__forward_is_class__ = is_class
         self.__forward_module__ = module
 
-    def _evaluate(self, globalns, localns, type_params, *, recursive_guard):
+    def _evaluate(self, globalns, localns, type_params=None, *, recursive_guard):
         if self.__forward_arg__ in recursive_guard:
             return self
         if not self.__forward_evaluated__ or localns is not globalns: