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Fix #19224 For loops over a hardcoded empty array crash the compiler (#20476)

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* Fix #11684 For loops over a hardcoded empty array crash the compiler

* Update t19224.nim
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Bung 2022-10-02 05:19:07 +08:00 • committed by GitHub
commit 567c3f055d
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compiler/semstmts.nim
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@ -853,6 +853,9 @@ proc semForVars(c: PContext, n: PNode; flags: TExprFlags): PNode =
var iterAfterVarLent = iter.skipTypes({tyGenericInst, tyAlias, tyLent, tyVar})
# n.len == 3 means that there is one for loop variable
# and thus no tuple unpacking:
if iterAfterVarLent.kind == tyEmpty:
localError(c.config, n[^2].info, "cannot infer element type of $1" %
renderTree(n[^2], {renderNoComments}))
if iterAfterVarLent.kind != tyTuple or n.len == 3:
if n.len == 3:
if n[0].kind == nkVarTuple: