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Mark AppliedType cachedSuper valid Nowhere when using provisional args #20527

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Merged
merged 5 commits into from
Jun 7, 2024
Merged

Mark AppliedType cachedSuper valid Nowhere when using provisional args #20527

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16b33a9
Mark AppliedType cachedSuper valid Nowhere when using provisional args
EugeneFlesselle Jun 5, 2024
59b0f3a
Reclassify test
EugeneFlesselle Jun 5, 2024
eaa673d
Add explanation doc
EugeneFlesselle Jun 6, 2024
ee54814
Keep `validUnderlyingMatch` inline with `validSuper`
EugeneFlesselle Jun 6, 2024
81a1184
Amend doc
EugeneFlesselle Jun 7, 2024
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4 changes: 3 additions & 1 deletion compiler/src/dotty/tools/dotc/core/Types.scala
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Original file line number Diff line number Diff line change
Expand Up @@ -4643,7 +4643,9 @@ object Types extends TypeUtils {
cachedSuper = tycon match
case tycon: HKTypeLambda => defn.AnyType
case tycon: TypeRef if tycon.symbol.isClass => tycon
case tycon: TypeProxy => tycon.superType.applyIfParameterized(args)
case tycon: TypeProxy =>
if validSuper != Nowhere && args.exists(_.isProvisional) then validSuper = Nowhere
tycon.superType.applyIfParameterized(args)
case _ => defn.AnyType
cachedSuper

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2 changes: 1 addition & 1 deletion tests/neg/typeclass-encoding3.scala → tests/pos/typeclass-encoding3b.scala
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Expand Up @@ -345,5 +345,5 @@ object functors {
}

MonadFlatten.flattened(List(List(1, 2, 3), List(4, 5))) // ok, synthesizes (using ListMonad)
MonadFlatten.flattened(List(List(1, 2, 3), List(4, 5)))(using ListMonad) // error
MonadFlatten.flattened(List(List(1, 2, 3), List(4, 5)))(using ListMonad)
}
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