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make var string return var char w/ BackwardsIndex (#15461)

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* make var string return var char w/ BackwardsIndex

fixes #14497

* work around VM bug
* properly workaround again
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hlaaftana 2020-11-12 13:44:21 +03:00 • committed by GitHub
commit 527e792827
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3 changed files with 11 additions and 3 deletions
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lib/system.nim
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@ -2579,6 +2579,7 @@ proc `[]`*[T](s: var openArray[T]; i: BackwardsIndex): var T {.inline.} =
system.`[]`(s, s.len - int(i))
proc `[]`*[Idx, T](a: var array[Idx, T]; i: BackwardsIndex): var T {.inline.} =
a[Idx(a.len - int(i) + int low(a))]
proc `[]`*(s: var string; i: BackwardsIndex): var char {.inline.} = s[s.len - int(i)]
proc `[]=`*[T](s: var openArray[T]; i: BackwardsIndex; x: T) {.inline.} =
system.`[]=`(s, s.len - int(i), x)