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Fix #19789: Merge same TypeParamRef in orDominator #20090

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merged 1 commit into from
Apr 10, 2024
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Fix #19789: Merge same TypeParamRef in orDominator #20090

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4 changes: 3 additions & 1 deletion compiler/src/dotty/tools/dotc/core/TypeOps.scala
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Original file line number Diff line number Diff line change
Expand Up @@ -249,7 +249,8 @@ object TypeOps:
mergeRefinedOrApplied(tp1, tp21) & mergeRefinedOrApplied(tp1, tp22)
case _ =>
fail
tp1 match {
if tp1 eq tp2 then tp1
else tp1 match {
case tp1 @ RefinedType(parent1, name1, rinfo1) =>
tp2 match {
case RefinedType(parent2, `name1`, rinfo2) =>
Expand All @@ -273,6 +274,7 @@ object TypeOps:
}
case AndType(tp11, tp12) =>
mergeRefinedOrApplied(tp11, tp2) & mergeRefinedOrApplied(tp12, tp2)
case tp1: TypeParamRef if tp1 == tp2 => tp1
case _ => fail
}
}
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5 changes: 5 additions & 0 deletions tests/pos/i19789.scala
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Original file line number Diff line number Diff line change
@@ -0,0 +1,5 @@
type Kinded[F[_]] = F[Any] | F[Nothing]

def values[F[_]]: Vector[Kinded[F]] = ???

def mapValues[F[_], T](f: Kinded[F] => T): Vector[T] = values[F].map { case x => f(x) }
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