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Some iterable in builtins

XXX: For JS backend: Currently due to Nim's inner buys, using of some iterable functions in this modules may result in Error: ...:

For details, trace:

Imports

Procs

func enumerate[T](x: Iterable[T]; start = 0): Enumerate[T]: Source Edit
func filter[T](comp: NoneType; iter: Iterable[T]): Filter[T]: Source Edit
func filter[T](comp: proc (arg: T): bool; iter: Iterable[T]): Filter[T]: Source Edit
func map[T, R](function: proc (x: T): R; iterable: Iterable[T]): Map[T]: Source Edit
func reversed[T](x: Sequence[T]): Reversed[T]: Source Edit
func zip[A, B](it1: Iterable[A]; it2: Iterable[B]; strict = false): Zip[A]: Source Edit

iterator enumerate[T](x: Iterable[T]; start = 0): (int, T): Source Edit
iterator filter[T](comp: NoneType; iter: Iterable[T]): T: Source Edit
iterator filter[T](comp: proc (arg: T): bool; iter: Iterable[T]): T: Source Edit
iterator items[T](x: Enumerate[T]): T: Source Edit
iterator items[T](x: Filter[T]): T: Source Edit
iterator items[T](x: Map[T]): T: Source Edit
iterator items[T](x: Reversed[T]): T: Source Edit
iterator items[T](x: Zip[T]): T: Source Edit
iterator map[T, R](function: proc (x: T): R; iterable: Iterable[T]): R: Source Edit
iterator reversed[T](x: Sequence[T]): T: Source Edit
iterator zip[A, B](it1: Iterable[A]; it2: Iterable[B]; strict = false): (A, B): Source Edit

macro zip(iterables_or_strict: varargs[untyped]): Zip: zip(*args, strict=False)

To support its similarity with Python's zip function signature, this macro signature has to be varargs[untyped].

So it's designed to be undefined when pylibDisableMoreArgsZip is defined.
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