Remove unused imports and other minor cleanups

 - Language imports are preceding other imports
 - Deleted empty file: InlineErasure
 - Removed some unused private[parallel] methods in
   scala/collection/parallel/package.scala

This removes hundreds of warnings when compiling with
"-Xlint -Ywarn-dead-code -Ywarn-unused -Ywarn-unused-import".

5 files changed, 8 insertions, 9 deletions

diff --git a/src/interactive/scala/tools/nsc/interactive/CompilerControl.scala b/src/interactive/scala/tools/nsc/interactive/CompilerControl.scala
index 586f011429..cb12cebc49 100644
--- a/src/interactive/scala/tools/nsc/interactive/CompilerControl.scala
+++ b/src/interactive/scala/tools/nsc/interactive/CompilerControl.scala
@@ -10,7 +10,7 @@ import scala.tools.nsc.io.AbstractFile
 import scala.tools.nsc.util.FailedInterrupt
 import scala.tools.nsc.util.EmptyAction
 import scala.tools.nsc.util.WorkScheduler
-import scala.reflect.internal.util.{SourceFile, Position}
+import scala.reflect.internal.util.SourceFile
 import scala.tools.nsc.util.InterruptReq
 
 /** Interface of interactive compiler to a client such as an IDE
@@ -189,7 +189,7 @@ trait CompilerControl { self: Global =>
    * continues with current pass.
    * Waits until source is fully type checked and returns body in response.
    * @param source     The source file that needs to be fully typed.
-   * @param keepLoaded Whether to keep that file in the PC if it was not loaded before. If 
+   * @param keepLoaded Whether to keep that file in the PC if it was not loaded before. If
                        the file is already loaded, this flag is ignored.
    * @param response   The response, which is set to the fully attributed tree of `source`.
    *                   If the unit corresponding to `source` has been removed in the meantime
diff --git a/src/interactive/scala/tools/nsc/interactive/Global.scala b/src/interactive/scala/tools/nsc/interactive/Global.scala
index 306a750de6..64535a749f 100644
--- a/src/interactive/scala/tools/nsc/interactive/Global.scala
+++ b/src/interactive/scala/tools/nsc/interactive/Global.scala
@@ -5,12 +5,12 @@
 package scala.tools.nsc
 package interactive
 
-import java.io.{ PrintWriter, StringWriter, FileReader, FileWriter }
+import java.io.{ FileReader, FileWriter }
 import scala.collection.mutable
-import mutable.{LinkedHashMap, SynchronizedMap, HashSet, SynchronizedSet}
+import mutable.{LinkedHashMap, HashSet, SynchronizedSet}
 import scala.util.control.ControlThrowable
 import scala.tools.nsc.io.AbstractFile
-import scala.reflect.internal.util.{ SourceFile, BatchSourceFile, Position, NoPosition }
+import scala.reflect.internal.util.SourceFile
 import scala.tools.nsc.reporters._
 import scala.tools.nsc.symtab._
 import scala.tools.nsc.typechecker.Analyzer
diff --git a/src/interactive/scala/tools/nsc/interactive/Pickler.scala b/src/interactive/scala/tools/nsc/interactive/Pickler.scala
index ddc0c8a068..c0446b0402 100644
--- a/src/interactive/scala/tools/nsc/interactive/Pickler.scala
+++ b/src/interactive/scala/tools/nsc/interactive/Pickler.scala
@@ -1,9 +1,9 @@
 package scala.tools.nsc.interactive
 
+import scala.language.implicitConversions
+
 import Lexer._
 import java.io.Writer
-import scala.language.implicitConversions
-import scala.reflect.ClassTag
 
 /** An abstract class for writing and reading Scala objects to and
  *  from a legible representation. The representation follows the following grammar:
diff --git a/src/interactive/scala/tools/nsc/interactive/REPL.scala b/src/interactive/scala/tools/nsc/interactive/REPL.scala
index ffa61b0524..e9cec31975 100644
--- a/src/interactive/scala/tools/nsc/interactive/REPL.scala
+++ b/src/interactive/scala/tools/nsc/interactive/REPL.scala
@@ -9,7 +9,6 @@ package interactive
 import scala.reflect.internal.util._
 import scala.tools.nsc.reporters._
 import scala.tools.nsc.io._
-import java.io.FileWriter
 
 /** Interface of interactive compiler to a client such as an IDE
  */
diff --git a/src/interactive/scala/tools/nsc/interactive/RichCompilationUnits.scala b/src/interactive/scala/tools/nsc/interactive/RichCompilationUnits.scala
index b83c2cd095..b82888b2aa 100644
--- a/src/interactive/scala/tools/nsc/interactive/RichCompilationUnits.scala
+++ b/src/interactive/scala/tools/nsc/interactive/RichCompilationUnits.scala
@@ -5,7 +5,7 @@
 package scala.tools.nsc
 package interactive
 
-import scala.reflect.internal.util.{SourceFile, Position, NoPosition}
+import scala.reflect.internal.util.SourceFile
 import scala.collection.mutable.ArrayBuffer
 
 trait RichCompilationUnits { self: Global =>