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discard """
output: '''16
32
48
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128
192
'''
"""
iterator gaz(it: iterator{.inline.}): type(it) =
for x in it:
yield x*2
iterator baz(it: iterator{.inline.}) =
for x in gaz(it):
yield x*2
type T1 = auto
iterator bar(it: iterator: T1{.inline.}): T1 =
for x in baz(it):
yield x*2
iterator foo[T](x: iterator: T{.inline.}): T =
for e in bar(x):
yield e*2
var s = @[1, 2, 3]
# pass an iterator several levels deep:
for x in s.items.foo:
echo x
# use some complex iterator as an input for another one:
for x in s.items.baz.foo:
echo x
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