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- # issue 7705, 7703, 7702
- discard """
- output: '''
- z
- e
- '''
- """
- type
- Reversable*[T] = concept a
- a[int] is T
- a.high is int
- a.len is int
- a.low is int
- proc get[T](s: Reversable[T], n: int): T =
- s[n]
- proc hi[T](s: Reversable[T]): int =
- s.high
- proc lo[T](s: Reversable[T]): int =
- s.low
- iterator reverse*[T](s: Reversable[T]): T =
- assert hi(s) - lo(s) == len(s) - 1
- for z in hi(s).countdown(lo(s)):
- yield s.get(z)
- for s in @["e", "z"].reverse:
- echo s
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