Merge pull request scala/scala#7002 from som-snytt/issue/reduce-noise

Reduce build noise

Author: adriaanm

library/src/scala/collection/StrictOptimizedSortedSetOps.scala

@@ -5,7 +5,6 @@ package collection
 import scala.annotation.implicitNotFound
 import scala.annotation.unchecked.uncheckedVariance
 import scala.language.higherKinds
-import scala.runtime.Statics
 
 /**
   * Trait that overrides sorted set operations to take advantage of strict builders.

library/src/scala/collection/immutable/ListSet.scala

@@ -6,7 +6,6 @@ import java.io.{ObjectInputStream, ObjectOutputStream}
 
 import mutable.{Builder, ImmutableBuilder}
 import scala.annotation.tailrec
-import scala.collection.immutable.List.empty
 
 /**
   * This class implements immutable sets using a list-based data structure. List set iterators and

library/src/scala/collection/immutable/Queue.scala

@@ -11,7 +11,6 @@ package immutable
 
 import java.io.{ObjectInputStream, ObjectOutputStream}
 
-import scala.collection.immutable.List.empty
 import scala.collection.mutable.{Builder, ListBuffer}
 
 /** `Queue` objects implement data structures that allow to

library/src/scala/collection/immutable/Set.scala

@@ -4,7 +4,6 @@ package immutable
 
 import java.io.{ObjectInputStream, ObjectOutputStream}
 
-import scala.collection.immutable.List.empty
 import scala.collection.mutable.{Builder, ImmutableBuilder}
 import scala.language.higherKinds
 

library/src/scala/collection/immutable/Vector.scala

@@ -6,8 +6,6 @@ import java.io.{ObjectInputStream, ObjectOutputStream}
 
 import scala.collection.mutable.{Builder, ReusableBuilder}
 import scala.annotation.unchecked.uncheckedVariance
-import scala.collection.immutable.List.empty
-import scala.collection.immutable.Set.empty
 
 /** $factoryInfo
   * @define Coll `Vector`

library/src/scala/collection/mutable/HashMap.scala

@@ -1,8 +1,7 @@
 package scala
 package collection.mutable
 
-import scala.collection.{AbstractIterator, Iterator, MapFactory, StrictOptimizedIterableOps, StrictOptimizedMapOps}
-import java.lang.String
+import scala.collection.{Iterator, MapFactory, StrictOptimizedIterableOps, StrictOptimizedMapOps}
 
 /** This class implements mutable maps using a hashtable.
   *