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fixes a long standing nil bug in substr

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Araq 2018-08-08 12:05:29 +02:00
commit 05121d84b3
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lib/system/sysstr.nim
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@ -95,6 +95,7 @@ proc mnewString(len: int): NimString {.compilerProc.} =
proc copyStrLast(s: NimString, start, last: int): NimString {.compilerProc.} =
let start = max(start, 0)
if s == nil: return nil
let len = min(last, s.len-1) - start + 1
if len > 0:
result = rawNewStringNoInit(len)