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fix ropes format errors (#16106) [backport:1.0]

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* fix rope index

* add testcase

* fix ropes format
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flywind 2020-11-24 02:23:52 +08:00 • committed by GitHub
commit 0c6c4be0e7
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2 changed files with 8 additions and 1 deletions
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lib/pure/ropes.nim
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@ -262,7 +262,7 @@ proc `%`*(frmt: string, args: openArray[Rope]): Rope {.
while true:
j = j * 10 + ord(frmt[i]) - ord('0')
inc(i)
if frmt[i] notin {'0'..'9'}: break
if i >= frmt.len or frmt[i] notin {'0'..'9'}: break
add(result, args[j-1])
of '{':
inc(i)