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Normalize prototype before decomposing as a function #13651

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Merged
merged 1 commit into from
Oct 6, 2021
Merged

Normalize prototype before decomposing as a function #13651

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2 changes: 1 addition & 1 deletion compiler/src/dotty/tools/dotc/typer/Typer.scala
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Original file line number Diff line number Diff line change
Expand Up @@ -1144,7 +1144,7 @@ class Typer extends Namer
case _ => mapOver(t)
}

val pt1 = pt.stripTypeVar.dealias
val pt1 = pt.stripTypeVar.dealias.normalized
if (pt1 ne pt1.dropDependentRefinement)
&& defn.isContextFunctionType(pt1.nonPrivateMember(nme.apply).info.finalResultType)
then
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15 changes: 15 additions & 0 deletions tests/pos/i13526.scala
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Original file line number Diff line number Diff line change
@@ -0,0 +1,15 @@
type ~>[Args <: Tuple, Return] = Args match {
case (arg1, arg2) => ((arg1, arg2) => Return)
}

trait Builder[Args <: NonEmptyTuple] {
def apply(f: Args ~> String): String
}

class BuilderImpl[Args <: NonEmptyTuple] extends Builder[Args] {
override def apply(f: Args ~> String): String = ???
}

val builder = BuilderImpl[Int *: String *: EmptyTuple]()
// builder { (i: Int, s: String) => "test" } // This line compiles
val _ = builder { (i, s) => "test" } // Does not compile