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fixes #18643 [backport:1.0] (#18678)

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Andreas Rumpf 2021-08-12 08:25:11 +02:00 • committed by GitHub
commit 018465a234
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2 changed files with 12 additions and 1 deletions
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compiler/ccgexprs.nim
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@ -920,7 +920,7 @@ proc genArrayElem(p: BProc, n, x, y: PNode, d: var TLoc) =
if optBoundsCheck in p.options and ty.kind != tyUncheckedArray:
if not isConstExpr(y):
# semantic pass has already checked for const index expressions
if firstOrd(p.config, ty) == 0:
if firstOrd(p.config, ty) == 0 and lastOrd(p.config, ty) >= 0:
if (firstOrd(p.config, b.t) < firstOrd(p.config, ty)) or (lastOrd(p.config, b.t) > lastOrd(p.config, ty)):
linefmt(p, cpsStmts, "if ((NU)($1) > (NU)($2)){ #raiseIndexError2($1, $2); $3}$n",
[rdCharLoc(b), intLiteral(lastOrd(p.config, ty)), raiseInstr(p)])