.Count = 'count': ClassType
.Count <: Iterable Int
.Count.
    __call__: (start: Int, step: Int) -> .Count

.Cycle = 'cycle': ClassType
.Cycle.
    __call__: |T|(iterable: Iterable T) -> Iterable T

.Repeat = 'repeat': ClassType
.Repeat.
    __call__: |T|(value: T, times := Nat) -> Iterable T

.Accumulate = 'accumulate': ClassType
.Accumulate.
    __call__: |T|(iterable: Iterable(T), func := (T, T) -> T) -> Iterable T

.Chain = 'chain': ClassType
.Chain.
    __call__: |T|(*iterables: Iterable T) -> Iterable T

.Compress = 'compress': ClassType
.Compress.
    __call__: |T|(data: Iterable(T), selectors: Iterable Bool) -> Iterable T

.DropWhile = 'dropwhile': ClassType
.DropWhile.
    __call__: |T|(predicate: (T) -> Bool, iterable: Iterable T) -> Iterable T

.FilterFalse = 'filterfalse': ClassType
.FilterFalse.
    __call__: |T|(predicate: (T) -> Bool, iterable: Iterable T) -> Iterable T

.GroupBy = 'groupby': ClassType
.GroupBy.
    __call__: |T, K|(iterable: Iterable(T), key := (T) -> K) -> Iterable((K, Iterable(T)))