unbound type variables

KT = TypeVar("KT") VT = TypeVar("VT")

def freeze_optional_dict( d: Union[None, Dict[KT, VT], ImmutableDict[KT, VT]]

^swh/model/model.py:49: error: Type variable "swh.model.model.KT" is unbound

swh/model/model.py:49: note: (Hint: Use "Generic[KT]" or "Protocol[KT]" base class to bind "KT" inside a class)

swh/model/model.py:49: note: (Hint: Use "KT" in function signature to bind "KT" inside a function)

swh/model/model.py:49: error: Type variable "swh.model.model.VT" is unbound

swh/model/model.py:49: note: (Hint: Use "Generic[VT]" or "Protocol[VT]" base class to bind "VT" inside a class)

swh/model/model.py:49: note: (Hint: Use "VT" in function signature to bind "VT" inside a function)

) -> Optional[ImmutableDict[KT, VT]]: if isinstance(d, dict): return ImmutableDict(d) else: return d

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Migrated from T2473 (view on Phabricator)