Gregory Beauregard <g...@greg.red> added the comment:
The reason this test passed before is a bit confusing. Run the following code
standalone to see where the type(TypeVar('T'))(name, bases, namespace) check is
coming from.
```
class TypeVar:
def __init__(self, name, *constraints):
# in actual TypeVar, each constraint is run through
# typing._type_check, casuing TypeError via not callable()
print(repr(constraints))
class V(TypeVar("T")):
pass
```
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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue46642>
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