Nested functions with generic type annotations using python 3.12 syntax is not supported

[JackismyShephard]

Describe the bug

The easiest way to explain this issue is with an example of a concrete failing function:

def confirmation_harness[T](x: T) -> Callable[..., T]:

    def _wrapped_fn() -> T:
        return x

    return _wrapped_fn

In this case gradio errors out with NameError: name 'T' is not defined because the occurrence of T in the inner function is not recognized.

A workaround is to use the old pre-3.12 way where T is defined as a stand alone variable like this:

....
T = TypeVar('T')
def confirmation_harness(x: T) -> Callable[..., T]:

    def _wrapped_fn() -> T:
        return x

    return _wrapped_fn

while this works it is not the recommended way of defining generics anymore, so I think the new way should be supported

Have you searched existing issues? 🔎

• I have searched and found no existing issues

Reproduction

import gradio as gr

Screenshot

No response

Logs

Traceback (most recent call last):
  File "C:\Users\Jacki\repositories\ultimate-rvc\src\ultimate_rvc\web\main.py", line 452, in <module>
    app = render_app()
          ^^^^^^^^^^^^
  File "C:\Users\Jacki\repositories\ultimate-rvc\src\ultimate_rvc\web\main.py", line 403, in render_app
    render_manage_audio_tab(
  File "C:\Users\Jacki\repositories\ultimate-rvc\src\ultimate_rvc\web\tabs\manage\audio.py", line 294, in render
    all_audio_click = all_audio_btn.click(
                      ^^^^^^^^^^^^^^^^^^^^
  File "C:\Users\Jacki\repositories\ultimate-rvc\uv\.venv\Lib\site-packages\gradio\events.py", line 670, in event_trigger
    dep, dep_index = root_block.set_event_trigger(
                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Users\Jacki\repositories\ultimate-rvc\uv\.venv\Lib\site-packages\gradio\blocks.py", line 803, in set_event_trigger
    check_function_inputs_match(fn, inputs, inputs_as_dict)
  File "C:\Users\Jacki\repositories\ultimate-rvc\uv\.venv\Lib\site-packages\gradio\utils.py", line 1007, in check_function_inputs_match
    parameter_types = get_type_hints(fn)
                      ^^^^^^^^^^^^^^^^^^
  File "C:\Users\Jacki\repositories\ultimate-rvc\uv\.venv\Lib\site-packages\gradio\utils.py", line 974, in get_type_hints
    return typing.get_type_hints(fn)
           ^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Users\Jacki\AppData\Local\Programs\Python\Python312\Lib\typing.py", line 2310, in get_type_hints
    hints[name] = _eval_type(value, globalns, localns, type_params)
                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Users\Jacki\AppData\Local\Programs\Python\Python312\Lib\typing.py", line 415, in _eval_type
    return t._evaluate(globalns, localns, type_params, recursive_guard=recursive_guard)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Users\Jacki\AppData\Local\Programs\Python\Python312\Lib\typing.py", line 947, in _evaluate
    eval(self.__forward_code__, globalns, localns),
    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "<string>", line 1, in <module>
NameError: name 'T' is not defined

System Info

windows 11
python 3.12
gradio 5.20.0

Severity

I can work around it