adapt to scala/scala#7696

SethTisue · SethTisue · commit 17647af000bd · 2019-02-01T13:55:40.000-08:00
diff --git a/build.sbt b/build.sbt
@@ -5,7 +5,7 @@ version in ThisBuild := "0.1.3-SNAPSHOT"
 resolvers in ThisBuild += "scala-integration" at "https://scala-ci.typesafe.com/artifactory/scala-integration/"
 
 scalaVersionsByJvm in ThisBuild := {
-  val v213 = "2.13.0-pre-b9306a2"
+  val v213 = "2.13.0-pre-e40c95e"
   Map(
     8 -> List(v213 -> true),
     11 -> List(v213 -> false))
diff --git a/core/src/main/scala/scala/collection/immutable/OldHashSet.scala b/core/src/main/scala/scala/collection/immutable/OldHashSet.scala
@@ -49,7 +49,7 @@ sealed abstract class OldHashSet[A]
       super.subsetOf(that)
   }
 
-  override def concat(that: collection.IterableOnce[A]): OldHashSet[A] = that match {
+  override def concat(that: collection.IterableOnce[A])(implicit dummy: DummyImplicit): OldHashSet[A] = that match {
     case that: OldHashSet[A] =>
       val buffer = new Array[OldHashSet[A]](bufferSize(this.size + that.size))
       nullToEmpty(union0(that, 0, buffer, 0))

Original file line number	Diff line number	Diff line change
`@@ -49,7 +49,7 @@ sealed abstract class OldHashSet[A]`
`49`	`49`	`super.subsetOf(that)`
`50`	`50`	`}`
`51`	`51`
`52`		`- override def concat(that: collection.IterableOnce[A]): OldHashSet[A] = that match {`
	`52`	`+ override def concat(that: collection.IterableOnce[A])(implicit dummy: DummyImplicit): OldHashSet[A] = that match {`
`53`	`53`	`case that: OldHashSet[A] =>`
`54`	`54`	`val buffer = new Array[OldHashSet[A]](bufferSize(this.size + that.size))`
`55`	`55`	`nullToEmpty(union0(that, 0, buffer, 0))`