PEP 585 type hints not rendered correctly

[Gobot1234]

Describe the bug

If you use a PEP 585 generic as an annotation i.e. list[str], autodoc renders the annotation as list rather than list[str], this behaviour differs from using typing.List[str] which renders as expected.

Fixing this is quite simple as far as I can tell,

sphinx/sphinx/util/typing.py

Lines 311 to 313 in 810a1e2

	elif (getattr(annotation, '__module__', None) == 'builtins' and
	hasattr(annotation, '__qualname__')):
	return annotation.__qualname__

just needs to check if the annotation has __args__ and if it does, return repr(annotation)

How to Reproduce

def foo() -> list[str]:
	...

.. autofunction:: foo

Expected behavior

An annotation of list[str] to be rendered as list[str]

Your project

https://github.com/Gobot1234/sphinx-test

Screenshots

OS

Mac

Python version

Python 3.9.3

Sphinx version

4.1.1

Sphinx extensions

autodoc

Extra tools

No response

Additional context

No response

[astrojuanlu]

Hi @Gobot1234 , would you please upload your project to GitHub instead? Google Drive is not very convenient to read code.

[Gobot1234]

https://github.com/Gobot1234/sphinx-test

[Gobot1234]

@astrojuanlu Should I open a PR to fix this?

[tk0miya]

@Gobot1234 Yes, please!