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error msg for #13864 (#13962)

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Co-authored-by: cooldome <ariabushenko@bk.ru>
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cooldome 2020-04-13 13:17:22 +01:00 • committed by GitHub
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5
compiler/semexprs.nim
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@ -189,6 +189,11 @@ proc isCastable(conf: ConfigRef; dst, src: PType): bool =
return false
if skipTypes(src, abstractInst-{tyTypeDesc}).kind == tyTypeDesc:
return false
if conf.selectedGC in {gcArc, gcOrc}:
let d = skipTypes(dst, abstractInst)
let s = skipTypes(src, abstractInst)
if d.kind == tyRef and s.kind == tyRef and s[0].isFinal != d[0].isFinal:
return false
var dstSize, srcSize: BiggestInt
dstSize = computeSize(conf, dst)