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added system.unown to make 'owned' sane to use in practice; later on we might change the type inference rules to make it more convenient

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Araq 2019-04-29 13:35:30 +02:00
commit 0a84b8fb4d
7 changed files with 53 additions and 9 deletions
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12
compiler/semstmts.nim
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@ -471,10 +471,14 @@ proc semVarOrLet(c: PContext, n: PNode, symkind: TSymKind): PNode =
($typ.kind).substr(2).toLowerAscii)
elif typ.kind == tyProc and tfUnresolved in typ.flags:
localError(c.config, def.info, errProcHasNoConcreteType % def.renderTree)
elif symkind == skVar and typ.kind == tyOwned and def.kind notin nkCallKinds:
# special type inference rule: 'var it = ownedPointer' is turned
# into an unowned pointer.
typ = typ.lastSon
when false:
# XXX This typing rule is neither documented nor complete enough to
# justify it. Instead use the newer 'unowned x' until we figured out
# a more general solution.
if symkind == skVar and typ.kind == tyOwned and def.kind notin nkCallKinds:
# special type inference rule: 'var it = ownedPointer' is turned
# into an unowned pointer.
typ = typ.lastSon
else:
if symkind == skLet: localError(c.config, a.info, errLetNeedsInit)