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Adjust definition of flatten to ensure that
flatten(X) == X
whenX
is a type variable which is unrelated to future types. It deletes the case which is explicitly dealing with type variables, and relies on the existing cases where the given type is related toFutureOr
orFuture
, but adds one thing: TheFutureOr
case is applicable to types that are bounded byFutureOr<S>
for someS
, not just the ones that areFutureOr<S>
, and this includesX extends FutureOr<S>
.