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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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