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IdiomBench (part 7)
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T = TypeVar('T')
Ts = TypeVarTuple('Ts')
def prefix_tuple(
x: T,
y: Tuple[*Ts]
) -> Tuple[T, *Ts]: ...
z = prefix_tuple(x=0, y=(True, 'a'))
# Inferred type of z is Tuple[int, bool, str]