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l-values are preserved modulo type distinction

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Araq 2011-09-24 13:15:11 +02:00
commit 033e3dfc50
4 changed files with 14 additions and 7 deletions
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compiler/semexprs.nim
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@ -378,6 +378,10 @@ proc isAssignable(c: PContext, n: PNode): TAssignableResult =
# Object and tuple conversions are still addressable, so we skip them
if skipTypes(n.typ, abstractPtrs).kind in {tyOpenArray, tyTuple, tyObject}:
result = isAssignable(c, n.sons[1])
elif equalOrDistinctOf(n.typ, n.sons[1].typ) or
equalOrDistinctOf(n.sons[1].typ, n.typ):
# types that are equal modulo distinction preserve l-value:
result = isAssignable(c, n.sons[1])
of nkHiddenDeref, nkDerefExpr:
result = arLValue
of nkObjUpConv, nkObjDownConv, nkCheckedFieldExpr: