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better support for view types (#15436)

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* you can put borrows into tables

* enforces mutating views only mutate mutable data
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Andreas Rumpf 2020-09-30 20:44:18 +02:00 • committed by GitHub
commit 86d7b63e2a
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5 changed files with 139 additions and 11 deletions
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compiler/typeallowed.nim
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@ -121,7 +121,7 @@ proc typeAllowedAux(marker: var IntSet, typ: PType, kind: TSymKind,
{tyChar, tyEnum, tyInt..tyFloat128, tyInt..tyUInt64}: result = t
of tyOpenArray:
# you cannot nest openArrays/sinks/etc.
if (kind != skParam and views notin c.features) or taIsOpenArray in flags:
if (kind != skParam or taIsOpenArray in flags) and views notin c.features:
result = t
else:
result = typeAllowedAux(marker, t[0], kind, c, flags+{taIsOpenArray})