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".

14 files changed, 29 insertions, 43 deletions

diff --git a/src/repl/scala/tools/nsc/MainGenericRunner.scala b/src/repl/scala/tools/nsc/MainGenericRunner.scala
index 34057ed341..747b684293 100644
--- a/src/repl/scala/tools/nsc/MainGenericRunner.scala
+++ b/src/repl/scala/tools/nsc/MainGenericRunner.scala
@@ -6,8 +6,8 @@
 package scala
 package tools.nsc
 
-import io.{ File }
-import util.{ ClassPath, ScalaClassLoader }
+import io.File
+import util.ClassPath
 import GenericRunnerCommand._
 
 object JarRunner extends CommonRunner {
diff --git a/src/repl/scala/tools/nsc/interpreter/ExprTyper.scala b/src/repl/scala/tools/nsc/interpreter/ExprTyper.scala
index 8a6a405810..01e3a90950 100644
--- a/src/repl/scala/tools/nsc/interpreter/ExprTyper.scala
+++ b/src/repl/scala/tools/nsc/interpreter/ExprTyper.scala
@@ -6,8 +6,6 @@
 package scala.tools.nsc
 package interpreter
 
-import scala.tools.nsc.ast.parser.Tokens.EOF
-
 trait ExprTyper {
   val repl: IMain
 
diff --git a/src/repl/scala/tools/nsc/interpreter/ILoop.scala b/src/repl/scala/tools/nsc/interpreter/ILoop.scala
index 57ba15e33b..459450a94e 100644
--- a/src/repl/scala/tools/nsc/interpreter/ILoop.scala
+++ b/src/repl/scala/tools/nsc/interpreter/ILoop.scala
@@ -12,18 +12,17 @@ import Predef.{ println => _, _ }
 import interpreter.session._
 import StdReplTags._
 import scala.tools.asm.ClassReader
-import scala.util.Properties.{ jdkHome, javaVersion, versionString, javaVmName }
-import scala.tools.nsc.util.{ ClassPath, Exceptional, stringFromWriter, stringFromStream }
+import scala.util.Properties.jdkHome
+import scala.tools.nsc.util.{ ClassPath, stringFromStream }
 import scala.reflect.classTag
 import scala.reflect.internal.util.{ BatchSourceFile, ScalaClassLoader }
 import ScalaClassLoader._
-import scala.reflect.io.{ File, Directory }
+import scala.reflect.io.File
 import scala.tools.util._
 import io.AbstractFile
-import scala.collection.generic.Clearable
-import scala.concurrent.{ ExecutionContext, Await, Future, future }
+import scala.concurrent.{ ExecutionContext, Await, Future }
 import ExecutionContext.Implicits._
-import java.io.{ BufferedReader, FileReader, StringReader }
+import java.io.BufferedReader
 
 import scala.util.{ Try, Success, Failure }
 
@@ -543,7 +542,6 @@ class ILoop(in0: Option[BufferedReader], protected val out: JPrintWriter)
             case i  => val n = s.take(i).toInt ; (n, s.drop(i+1).toInt - n)
           }
         }
-      import scala.collection.JavaConverters._
       val index = (start - 1) max 0
       val text = history.asStrings(index, index + len) mkString "\n"
       edit(text)
@@ -906,7 +904,7 @@ class ILoop(in0: Option[BufferedReader], protected val out: JPrintWriter)
 
     // sets in to some kind of reader depending on environmental cues
     in = in0.fold(chooseReader(settings))(r => SimpleReader(r, out, interactive = true))
-    globalFuture = future {
+    globalFuture = Future {
       intp.initializeSynchronous()
       loopPostInit()
       !intp.reporter.hasErrors
diff --git a/src/repl/scala/tools/nsc/interpreter/IMain.scala b/src/repl/scala/tools/nsc/interpreter/IMain.scala
index ef6ab4063a..893bde42ab 100644
--- a/src/repl/scala/tools/nsc/interpreter/IMain.scala
+++ b/src/repl/scala/tools/nsc/interpreter/IMain.scala
@@ -15,19 +15,14 @@ import scala.concurrent.{ Future, ExecutionContext }
 import scala.reflect.runtime.{ universe => ru }
 import scala.reflect.{ ClassTag, classTag }
 import scala.reflect.internal.util.{ BatchSourceFile, SourceFile }
-import scala.tools.nsc.interactive
-import scala.tools.nsc.reporters.StoreReporter
-import scala.tools.nsc.util.ClassPath.DefaultJavaContext
 import scala.tools.util.PathResolverFactory
 import scala.tools.nsc.io.AbstractFile
 import scala.tools.nsc.typechecker.{ TypeStrings, StructuredTypeStrings }
 import scala.tools.nsc.util._
 import ScalaClassLoader.URLClassLoader
 import scala.tools.nsc.util.Exceptional.unwrap
-import scala.tools.nsc.backend.JavaPlatform
 import javax.script.{AbstractScriptEngine, Bindings, ScriptContext, ScriptEngine, ScriptEngineFactory, ScriptException, CompiledScript, Compilable}
 import java.net.URL
-import java.io.File
 
 /** An interpreter for Scala code.
  *
diff --git a/src/repl/scala/tools/nsc/interpreter/Imports.scala b/src/repl/scala/tools/nsc/interpreter/Imports.scala
index 5742c1d0d8..6a75432ac6 100644
--- a/src/repl/scala/tools/nsc/interpreter/Imports.scala
+++ b/src/repl/scala/tools/nsc/interpreter/Imports.scala
@@ -6,13 +6,13 @@
 package scala.tools.nsc
 package interpreter
 
-import scala.collection.{ mutable, immutable }
+import scala.collection.mutable
 
 trait Imports {
   self: IMain =>
 
   import global._
-  import definitions.{ ObjectClass, ScalaPackage, JavaLangPackage, PredefModule }
+  import definitions.{ ScalaPackage, JavaLangPackage, PredefModule }
   import memberHandlers._
 
   /** Synthetic import handlers for the language defined imports. */
diff --git a/src/repl/scala/tools/nsc/interpreter/JavapClass.scala b/src/repl/scala/tools/nsc/interpreter/JavapClass.scala
index 04f4512717..034437fe5c 100644
--- a/src/repl/scala/tools/nsc/interpreter/JavapClass.scala
+++ b/src/repl/scala/tools/nsc/interpreter/JavapClass.scala
@@ -6,23 +6,23 @@ package scala
 package tools.nsc
 package interpreter
 
+import scala.language.reflectiveCalls
+
 import java.lang.{ Iterable => JIterable }
-import scala.tools.nsc.util.ScalaClassLoader
+import scala.reflect.internal.util.ScalaClassLoader
 import java.io.{ ByteArrayInputStream, CharArrayWriter, FileNotFoundException, PrintWriter, StringWriter, Writer }
 import java.util.{ Locale }
 import java.util.concurrent.ConcurrentLinkedQueue
-import javax.tools.{ Diagnostic, DiagnosticCollector, DiagnosticListener,
+import javax.tools.{ Diagnostic, DiagnosticListener,
                      ForwardingJavaFileManager, JavaFileManager, JavaFileObject,
                      SimpleJavaFileObject, StandardLocation }
-import scala.reflect.io.{ AbstractFile, Directory, File, Path }
+import scala.reflect.io.File
 import scala.io.Source
 import scala.util.{ Try, Success, Failure }
 import scala.util.Properties.{ lineSeparator => EOL }
-import scala.util.matching.Regex
 import scala.collection.JavaConverters._
 import scala.collection.generic.Clearable
 import java.net.URL
-import scala.language.reflectiveCalls
 import Javap.{ JpResult, JpError, Showable, helper, toolArgs, DefaultOptions }
 
 /** Javap command implementation.
@@ -214,7 +214,6 @@ class JavapClass(
     ) orFailed null
 
     class JavaReporter extends DiagnosticListener[JavaFileObject] with Clearable {
-      import scala.collection.mutable.{ ArrayBuffer, SynchronizedBuffer }
       type D = Diagnostic[_ <: JavaFileObject]
       val diagnostics = new ConcurrentLinkedQueue[D]
       override def report(d: Diagnostic[_ <: JavaFileObject]) {
@@ -342,8 +341,6 @@ class JavapClass(
 }
 
 object JavapClass {
-  import scala.tools.asm.ClassReader
-  import scala.tools.asm.tree.{ ClassNode, MethodNode }
 
   def apply(
     loader: ScalaClassLoader = ScalaClassLoader.appLoader,
diff --git a/src/repl/scala/tools/nsc/interpreter/LoopCommands.scala b/src/repl/scala/tools/nsc/interpreter/LoopCommands.scala
index 9f555aee14..8c3b174513 100644
--- a/src/repl/scala/tools/nsc/interpreter/LoopCommands.scala
+++ b/src/repl/scala/tools/nsc/interpreter/LoopCommands.scala
@@ -8,10 +8,10 @@ package tools
 package nsc
 package interpreter
 
-import scala.collection.{ mutable, immutable }
-import mutable.ListBuffer
 import scala.language.implicitConversions
 
+import scala.collection.mutable.ListBuffer
+
 class ProcessResult(val line: String) {
   import scala.sys.process._
   private val buffer = new ListBuffer[String]
diff --git a/src/repl/scala/tools/nsc/interpreter/MemberHandlers.scala b/src/repl/scala/tools/nsc/interpreter/MemberHandlers.scala
index 4e45f6d615..d6c0dafaf2 100644
--- a/src/repl/scala/tools/nsc/interpreter/MemberHandlers.scala
+++ b/src/repl/scala/tools/nsc/interpreter/MemberHandlers.scala
@@ -6,9 +6,10 @@
 package scala.tools.nsc
 package interpreter
 
-import scala.collection.{ mutable, immutable }
 import scala.language.implicitConversions
 
+import scala.collection.mutable
+
 trait MemberHandlers {
   val intp: IMain
 
diff --git a/src/repl/scala/tools/nsc/interpreter/NamedParam.scala b/src/repl/scala/tools/nsc/interpreter/NamedParam.scala
index a0af72940a..d59b07a452 100644
--- a/src/repl/scala/tools/nsc/interpreter/NamedParam.scala
+++ b/src/repl/scala/tools/nsc/interpreter/NamedParam.scala
@@ -6,10 +6,11 @@
 package scala.tools.nsc
 package interpreter
 
-import NamedParam._
 import scala.language.implicitConversions
+
+import NamedParam._
 import scala.reflect.runtime.{universe => ru}
-import scala.reflect.{ClassTag, classTag}
+import scala.reflect.{ClassTag}
 import scala.tools.nsc.typechecker.{ TypeStrings }
 
 trait NamedParamCreator {
diff --git a/src/repl/scala/tools/nsc/interpreter/Phased.scala b/src/repl/scala/tools/nsc/interpreter/Phased.scala
index 3dda323762..d1d422ce3e 100644
--- a/src/repl/scala/tools/nsc/interpreter/Phased.scala
+++ b/src/repl/scala/tools/nsc/interpreter/Phased.scala
@@ -6,7 +6,6 @@
 package scala.tools.nsc
 package interpreter
 
-import scala.collection.immutable
 import scala.language.implicitConversions
 
 /** Mix this into an object and use it as a phasing
diff --git a/src/repl/scala/tools/nsc/interpreter/Power.scala b/src/repl/scala/tools/nsc/interpreter/Power.scala
index a14a60d216..3c08a03c94 100644
--- a/src/repl/scala/tools/nsc/interpreter/Power.scala
+++ b/src/repl/scala/tools/nsc/interpreter/Power.scala
@@ -6,14 +6,13 @@
 package scala.tools.nsc
 package interpreter
 
-import scala.collection.{ mutable, immutable }
-import scala.util.matching.Regex
-import scala.io.Codec
-import java.net.{ URL, MalformedURLException }
-import io.{ Path }
 import scala.language.implicitConversions
+
+import scala.collection.mutable
+import scala.io.Codec
+import java.net.URL
 import scala.reflect.runtime.{universe => ru}
-import scala.reflect.{ClassTag, classTag}
+import scala.reflect.ClassTag
 
 /** Collecting some power mode examples.
 
@@ -43,7 +42,7 @@ Lost after 18/flatten {
 /** A class for methods to be injected into the intp in power mode.
  */
 class Power[ReplValsImpl <: ReplVals : ru.TypeTag: ClassTag](val intp: IMain, replVals: ReplValsImpl) {
-  import intp.{ beQuietDuring, typeOfExpression, interpret, parse }
+  import intp.{ beQuietDuring, parse }
   import intp.global._
   import definitions.{ compilerTypeFromTag, compilerSymbolFromTag}
 
diff --git a/src/repl/scala/tools/nsc/interpreter/PresentationCompilerCompleter.scala b/src/repl/scala/tools/nsc/interpreter/PresentationCompilerCompleter.scala
index 62e12f8703..a912ec9749 100644
--- a/src/repl/scala/tools/nsc/interpreter/PresentationCompilerCompleter.scala
+++ b/src/repl/scala/tools/nsc/interpreter/PresentationCompilerCompleter.scala
@@ -4,7 +4,6 @@
  */
 package scala.tools.nsc.interpreter
 
-import scala.reflect.internal.Flags
 import scala.reflect.internal.util.StringOps
 import scala.tools.nsc.interpreter.Completion.Candidates
 import scala.util.control.NonFatal
diff --git a/src/repl/scala/tools/nsc/interpreter/RichClass.scala b/src/repl/scala/tools/nsc/interpreter/RichClass.scala
index 36cdf65510..df900d1436 100644
--- a/src/repl/scala/tools/nsc/interpreter/RichClass.scala
+++ b/src/repl/scala/tools/nsc/interpreter/RichClass.scala
@@ -6,7 +6,7 @@
 package scala.tools.nsc
 package interpreter
 
-import scala.reflect.{ ClassTag, classTag }
+import scala.reflect.ClassTag
 
 class RichClass[T](val clazz: Class[T]) {
   def toTag: ClassTag[T] = ClassTag[T](clazz)
diff --git a/src/repl/scala/tools/nsc/interpreter/session/SimpleHistory.scala b/src/repl/scala/tools/nsc/interpreter/session/SimpleHistory.scala
index 504d0d30ee..92bf9d1df4 100644
--- a/src/repl/scala/tools/nsc/interpreter/session/SimpleHistory.scala
+++ b/src/repl/scala/tools/nsc/interpreter/session/SimpleHistory.scala
@@ -8,7 +8,6 @@ package interpreter
 package session
 
 import scala.collection.mutable.{ Buffer, ListBuffer }
-import scala.collection.JavaConverters._
 
 class SimpleHistory extends History {
   private var _index: Int = 0