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discard type is an error, fixes #7470 (#11146)

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Jasper Jenkins 2019-04-30 23:53:20 -07:00 • committed by Andreas Rumpf
commit 60e3d7930d
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compiler/semstmts.nim
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@ -43,7 +43,7 @@ proc semDiscard(c: PContext, n: PNode): PNode =
n.sons[0] = semExprWithType(c, n.sons[0])
let sonType = n.sons[0].typ
let sonKind = n.sons[0].kind
if isEmptyType(sonType) or sonType.kind == tyNone or n.sons[0].kind == nkTypeOfExpr:
if isEmptyType(sonType) or sonType.kind in {tyNone, tyTypeDesc} or sonKind == nkTypeOfExpr:
localError(c.config, n.info, errInvalidDiscard)
if sonType.kind == tyProc and sonKind notin nkCallKinds:
# tyProc is disallowed to prevent ``discard foo`` to be valid, when ``discard foo()`` is meant.