pypy 3.6.9 equivalent always throws an error on yield

I have already done, pip install async-exit-stack async-generator multiple times. However, the application still gives an error

ERROR:    Exception in ASGI application
Traceback (most recent call last):
  File "/usr/local/site-packages/uvicorn/protocols/http/h11_impl.py", line 384, in run_asgi
    result = await app(self.scope, self.receive, self.send)
  File "/usr/local/site-packages/uvicorn/middleware/proxy_headers.py", line 45, in __call__
    return await self.app(scope, receive, send)
  File "/usr/local/site-packages/starlette/routing.py", line 550, in __call__
    await route.handle(scope, receive, send)
  File "/usr/local/site-packages/starlette/routing.py", line 227, in handle
    await self.app(scope, receive, send)
  File "/usr/local/site-packages/starlette/routing.py", line 41, in app
    response = await func(request)
  File "/usr/local/site-packages/fastapi/routing.py", line 190, in app
    dependency_overrides_provider=dependency_overrides_provider,
  File "/usr/local/site-packages/fastapi/dependencies/utils.py", line 512, in solve_dependencies
    async_contextmanager_dependencies_error
RuntimeError: 
FastAPI dependencies with yield require Python 3.7 or above,
or the backports for Python 3.6, installed with:
    pip install async-exit-stack async-generator

[chris-allnutt]

Is there any reason why you can’t use python 3.7?

[tiangolo]

Hey there! Have you tried recent versions of PyPy? It seems the current PyPy is equivalent to 3.7, that wouldn’t have these issues.

Sorry for the long delay! 🙈 I wanted to personally address each issue/PR and they piled up through time, but now I’m checking each one in order.