Created in different context error

[gokhan721]

Hi all,

Everything has worked fine for ContextVarsScopeManager if I have only Fastapi application. But, When I tried to mount a Flask WSGIApplication to the Fastapi application, I've got an error from ContextVarsScopeManager as "<Token var=<ContextVar name='scope' at 0x7ff47d568a90> at 0x7ff47d61fe00> was created in a different Context". This error has been raised from after_request function of tracer.wrappers.fastapi.fastapi_wrapper module while trying to close scope. When I debugged the code, I have found out that "if token._var is not self" check into reset function of ContextVar class has caused this exception. I've created a sample project to reproduce the issue and shared it's Github url below.

Github url: https://github.com/gokhan721/opentracing_contextvar_work

Thanks.

[emmettbutler]

I've encountered what appears to be the same issue under Python 2.7.