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Fix array's high & low return type for empty arrays (#17705)

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* fix array.high/low return type

* Add test for empty array low return type

Co-authored-by: konsumlamm <44230978+konsumlamm@users.noreply.github.com>

Co-authored-by: konsumlamm <44230978+konsumlamm@users.noreply.github.com>
This commit is contained in:
Tanguy Cizain 2021-04-15 15:45:38 +02:00 • committed by GitHub
commit 363467fc00
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compiler/semexprs.nim
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@ -379,6 +379,8 @@ proc semLowHigh(c: PContext, n: PNode, m: TMagic): PNode =
n.typ = getSysType(c.graph, n.info, tyInt)
of tyArray:
n.typ = typ[0] # indextype
if n.typ.kind == tyRange and emptyRange(n.typ.n[0], n.typ.n[1]): #Invalid range
n.typ = getSysType(c.graph, n.info, tyInt)
of tyInt..tyInt64, tyChar, tyBool, tyEnum, tyUInt..tyUInt64, tyFloat..tyFloat64:
n.typ = n[1].typ.skipTypes({tyTypeDesc})
of tyGenericParam: