Description of problem:

I encountered upstream bug https://github.com/samuelcolvin/pydantic/issues/1985 when building the latest version of python-fastapi (which used python-pydantic) for Fedora 34

Version-Release number of selected component (if applicable): 1.6.1-2.fc34


How reproducible:


Steps to Reproduce:
1. fedpkg co python-fastapi
2. fedpkg mockbuild --root fedora-34-x86_64, or fedpkg scratch-build --target f34

Actual results:

________________ ERROR collecting tests/test_security_oauth2.py ________________
tests/test_security_oauth2.py:31: in <module>
    def login(form_data: "OAuth2PasswordRequestFormStrict" = Depends()):
../../BUILDROOT/python-fastapi-0.63.0-3.fc34.noarch/usr/lib/python3.9/site-packages/fastapi/routing.py:551: in decorator
    self.add_api_route(
../../BUILDROOT/python-fastapi-0.63.0-3.fc34.noarch/usr/lib/python3.9/site-packages/fastapi/routing.py:496: in add_api_route
    route = route_class(
../../BUILDROOT/python-fastapi-0.63.0-3.fc34.noarch/usr/lib/python3.9/site-packages/fastapi/routing.py:380: in __init__
    self.dependant = get_dependant(path=self.path_format, call=self.endpoint)
../../BUILDROOT/python-fastapi-0.63.0-3.fc34.noarch/usr/lib/python3.9/site-packages/fastapi/dependencies/utils.py:288: in get_dependant
    endpoint_signature = get_typed_signature(call)
../../BUILDROOT/python-fastapi-0.63.0-3.fc34.noarch/usr/lib/python3.9/site-packages/fastapi/dependencies/utils.py:246: in get_typed_signature
    typed_params = [
../../BUILDROOT/python-fastapi-0.63.0-3.fc34.noarch/usr/lib/python3.9/site-packages/fastapi/dependencies/utils.py:251: in <listcomp>
    annotation=get_typed_annotation(param, globalns),
../../BUILDROOT/python-fastapi-0.63.0-3.fc34.noarch/usr/lib/python3.9/site-packages/fastapi/dependencies/utils.py:263: in get_typed_annotation
    annotation = evaluate_forwardref(annotation, globalns, globalns)
/usr/lib/python3.9/site-packages/pydantic/typing.py:50: in evaluate_forwardref
    return type_._evaluate(globalns, localns)
E   TypeError: _evaluate() missing 1 required positional argument: 'recursive_guard'
__________ ERROR collecting tests/test_validate_response_recursive.py __________
tests/test_validate_response_recursive.py:15: in <module>
    RecursiveItem.update_forward_refs()
/usr/lib/python3.9/site-packages/pydantic/main.py:677: in update_forward_refs
    update_field_forward_refs(f, globalns=globalns, localns=localns)
/usr/lib/python3.9/site-packages/pydantic/typing.py:233: in update_field_forward_refs
    field.type_ = evaluate_forwardref(field.type_, globalns, localns or None)
/usr/lib/python3.9/site-packages/pydantic/typing.py:50: in evaluate_forwardref
    return type_._evaluate(globalns, localns)
E   TypeError: _evaluate() missing 1 required positional argument: 'recursive_guard'

Expected results:

Success

Additional info:

The fix is in version 1.7, but that release also contains a breaking API change from 1.6.x. If it’s not possible to rush an update to a 1.7.x release before the Fedora 34 final freeze, it may be possible to backport https://github.com/samuelcolvin/pydantic/pull/1844.