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fixes #21027; cast expressions need a type (#21029)

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* fixes #21027; cast expressions need a type

* Apply suggestions from code review

Thanks to @beef331
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ringabout 2022-12-06 20:09:50 +08:00 • committed by GitHub
commit 1564ae650f
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2 changed files with 7 additions and 0 deletions
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2
compiler/semexprs.nim
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@ -394,6 +394,8 @@ proc semCast(c: PContext, n: PNode): PNode =
let castedExpr = semExprWithType(c, n[1]) let castedExpr = semExprWithType(c, n[1])
if castedExpr.kind == nkClosedSymChoice: if castedExpr.kind == nkClosedSymChoice:
errorUseQualifier(c, n[1].info, castedExpr) errorUseQualifier(c, n[1].info, castedExpr)
if targetType == nil:
localError(c.config, n.info, "Invalid usage of cast, cast requires a type to convert to, e.g., cast[int](0d).")
if tfHasMeta in targetType.flags: if tfHasMeta in targetType.flags:
localError(c.config, n[0].info, "cannot cast to a non concrete type: '$1'" % $targetType) localError(c.config, n[0].info, "cannot cast to a non concrete type: '$1'" % $targetType)
if not isCastable(c, targetType, castedExpr.typ, n.info): if not isCastable(c, targetType, castedExpr.typ, n.info):

5
tests/types/t21027.nim Normal file
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@ -0,0 +1,5 @@
discard """
errormsg: "Invalid usage of cast, cast requires a type to convert to, e.g., cast[int](0d)."
"""
# bug #21027
let x: uint64 = cast(5)