from typing import TypeVarTuple, Unpack, Generic
from collections.abc import Callable

Args = TypeVarTuple("Args")

class Built(Generic[Unpack[Args]]):
    pass

def example(n: Built[Unpack[Args]] | Callable[[Unpack[Args]], None]) -> Built[Unpack[Args]]: ...

reveal_type(example)  # N: Revealed type is "def [Args] (n: Union[__main__.Built[Unpack[Args`-1]], def (*Unpack[Args`-1])]) -> __main__.Built[Unpack[Args`-1]]"

@example  # E: Argument 1 to "example" has incompatible type "Callable[[], None]"; expected "Built[*tuple[Never, ...]] | Callable[[VarArg(Never)], None]"
def command1() -> None:
    return