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Fix derivedPolyProto to use the correct result type #14148

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Merged
merged 1 commit into from
Dec 21, 2021
Merged

Fix derivedPolyProto to use the correct result type #14148

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2 changes: 1 addition & 1 deletion compiler/src/dotty/tools/dotc/typer/ProtoTypes.scala
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Original file line number Diff line number Diff line change
Expand Up @@ -582,7 +582,7 @@ object ProtoTypes {
override def isMatchedBy(tp: Type, keepConstraint: Boolean)(using Context): Boolean =
canInstantiate(tp) || tp.member(nme.apply).hasAltWith(d => canInstantiate(d.info))

def derivedPolyProto(targs: List[Tree], resultType: Type): PolyProto =
def derivedPolyProto(targs: List[Tree], resType: Type): PolyProto =
if ((targs eq this.targs) && (resType eq this.resType)) this
else PolyProto(targs, resType)

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4 changes: 4 additions & 0 deletions tests/neg/i14145.scala
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Original file line number Diff line number Diff line change
@@ -0,0 +1,4 @@
val l: List[Option[Int]] = List(None, Some(1), None)

@main def m15 =
l.collectFirst(Some.unapply.unlift[Option[Int], Int]) // error