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Fix a case of MT reduction using abstract types #18243

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Fix a case of MT reduction using abstract types #18243

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2 changes: 1 addition & 1 deletion compiler/src/dotty/tools/dotc/core/TypeComparer.scala
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Expand Up @@ -1030,7 +1030,7 @@ class TypeComparer(@constructorOnly initctx: Context) extends ConstraintHandling
tp1.cases.corresponds(tp2.cases)(isSubType)
case _ => false
}
(!caseLambda.exists || canWidenAbstract) && recur(tp1.underlying, tp2) || compareMatch
recur(tp1.underlying, tp2) || compareMatch
case tp1: AnnotatedType if tp1.isRefining =>
isNewSubType(tp1.parent)
case JavaArrayType(elem1) =>
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1 change: 1 addition & 0 deletions compiler/test/dotc/pos-test-pickling.blacklist
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Expand Up @@ -53,6 +53,7 @@ i15827.scala
i17149.scala
tuple-fold.scala
mt-redux-norm.perspective.scala
i18202.scala

# Opaque type
i5720.scala
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7 changes: 7 additions & 0 deletions tests/pos/i18202.scala
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@@ -0,0 +1,7 @@
import compiletime.ops.int.*

type TupleIndex[T <: Tuple, A, I <: Int] <: (Any, Int) = T match
case A *: _ => (A, I)
case _ *: t => TupleIndex[t, A, S[I]]

def tupleIndex[T <: Tuple, A](using i: ValueOf[Tuple.Elem[TupleIndex[T, A, 0], 1]]): Int = i.value