wip: add @uncheckedVariance

Author: SethTisue

core/src/main/scala/scala/collection/CustomParallelizable.scala

@@ -14,9 +14,10 @@ package scala
 package collection
 
 import parallel.Combiner
+import scala.annotation.unchecked.uncheckedVariance
 
 trait CustomParallelizable[+A, +ParRepr <: Parallel] extends Any with Parallelizable[A, ParRepr] {
   override def par: ParRepr
-  override protected[this] def parCombiner: Combiner[A, ParRepr] = throw new UnsupportedOperationException("")
+  override protected[this] def parCombiner: Combiner[A @uncheckedVariance , ParRepr] = throw new UnsupportedOperationException("")
 }
 

core/src/main/scala/scala/collection/Parallelizable.scala

@@ -14,6 +14,7 @@ package scala
 package collection
 
 import parallel.Combiner
+import scala.annotation.unchecked.uncheckedVariance
 
 /** This trait describes collections which can be turned into parallel collections
  *  by invoking the method `par`. Parallelizable collections may be parameterized with
@@ -48,6 +49,6 @@ trait Parallelizable[+A, +ParRepr <: Parallel] extends Any {
    *
    *  @return  a combiner for the parallel collection of type `ParRepr`
    */
-  protected[this] def parCombiner: Combiner[A, ParRepr]
+  protected[this] def parCombiner: Combiner[A @uncheckedVariance, ParRepr]
 }
 

core/src/main/scala/scala/collection/generic/GenericParTemplate.scala

@@ -31,9 +31,9 @@ trait GenericParTemplate[+A, +CC[X] <: ParIterable[X]]
 {
   def companion: GenericParCompanion[CC]
 
-  protected[this] override def newBuilder: scala.collection.mutable.Builder[A, CC[A]] = newCombiner
+  protected[this] override def newBuilder: scala.collection.mutable.Builder[A @uncheckedVariance, CC[A] @uncheckedVariance] = newCombiner
 
-  protected[this] override def newCombiner: Combiner[A, CC[A]] = {
+  protected[this] override def newCombiner: Combiner[A @uncheckedVariance, CC[A] @uncheckedVariance] = {
     val cb = companion.newCombiner[A]
     cb
   }
@@ -50,7 +50,7 @@ trait GenericParTemplate[+A, +CC[X] <: ParIterable[X]]
 
 trait GenericParMapTemplate[K, +V, +CC[X, Y] <: ParMap[X, Y]] extends GenericParTemplate[(K, V), ParIterable]
 {
-  protected[this] override def newCombiner: Combiner[(K, V), CC[K, V]] = {
+  protected[this] override def newCombiner: Combiner[(K, V @uncheckedVariance), CC[K, V @uncheckedVariance]] = {
     val cb = mapCompanion.newCombiner[K, V]
     cb
   }