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".

9 files changed, 10 insertions, 19 deletions

diff --git a/src/compiler/scala/tools/nsc/ast/Printers.scala b/src/compiler/scala/tools/nsc/ast/Printers.scala
index f3def3c80c..8b37948e9b 100644
--- a/src/compiler/scala/tools/nsc/ast/Printers.scala
+++ b/src/compiler/scala/tools/nsc/ast/Printers.scala
@@ -6,7 +6,7 @@
 package scala.tools.nsc
 package ast
 
-import java.io.{ OutputStream, PrintWriter, StringWriter, Writer }
+import java.io.{ OutputStream, PrintWriter }
 
 trait Printers extends scala.reflect.internal.Printers { this: Global =>
 
diff --git a/src/compiler/scala/tools/nsc/ast/TreeBrowsers.scala b/src/compiler/scala/tools/nsc/ast/TreeBrowsers.scala
index eafecf9462..105bdee256 100644
--- a/src/compiler/scala/tools/nsc/ast/TreeBrowsers.scala
+++ b/src/compiler/scala/tools/nsc/ast/TreeBrowsers.scala
@@ -7,7 +7,9 @@ package scala
 package tools.nsc
 package ast
 
-import java.awt.{List => awtList, _}
+import scala.language.implicitConversions
+
+import java.awt.{List => _, _}
 import java.awt.event._
 import java.io.StringWriter
 
@@ -17,7 +19,6 @@ import javax.swing.tree._
 
 import scala.concurrent.Lock
 import scala.text._
-import scala.language.implicitConversions
 
 /**
  * Tree browsers can show the AST in a graphical and interactive
diff --git a/src/compiler/scala/tools/nsc/ast/TreeDSL.scala b/src/compiler/scala/tools/nsc/ast/TreeDSL.scala
index 6dda30b5e7..9e1498cf3e 100644
--- a/src/compiler/scala/tools/nsc/ast/TreeDSL.scala
+++ b/src/compiler/scala/tools/nsc/ast/TreeDSL.scala
@@ -7,7 +7,6 @@
 package scala.tools.nsc
 package ast
 
-import symtab.Flags
 import scala.language.implicitConversions
 
 /** A DSL for generating scala code.  The goal is that the
diff --git a/src/compiler/scala/tools/nsc/ast/Trees.scala b/src/compiler/scala/tools/nsc/ast/Trees.scala
index 934257092f..2d47e254e5 100644
--- a/src/compiler/scala/tools/nsc/ast/Trees.scala
+++ b/src/compiler/scala/tools/nsc/ast/Trees.scala
@@ -7,13 +7,6 @@ package scala.tools.nsc
 package ast
 
 import scala.reflect.ClassTag
-import scala.reflect.internal.Flags.BYNAMEPARAM
-import scala.reflect.internal.Flags.DEFAULTPARAM
-import scala.reflect.internal.Flags.IMPLICIT
-import scala.reflect.internal.Flags.PARAM
-import scala.reflect.internal.Flags.PARAMACCESSOR
-import scala.reflect.internal.Flags.PRESUPER
-import scala.reflect.internal.Flags.TRAIT
 import scala.compat.Platform.EOL
 
 trait Trees extends scala.reflect.internal.Trees { self: Global =>
diff --git a/src/compiler/scala/tools/nsc/ast/parser/MarkupParsers.scala b/src/compiler/scala/tools/nsc/ast/parser/MarkupParsers.scala
index 52b8a51a79..46d533b037 100644
--- a/src/compiler/scala/tools/nsc/ast/parser/MarkupParsers.scala
+++ b/src/compiler/scala/tools/nsc/ast/parser/MarkupParsers.scala
@@ -12,7 +12,7 @@ import mutable.{ Buffer, ArrayBuffer, ListBuffer }
 import scala.util.control.ControlThrowable
 import scala.tools.nsc.util.CharArrayReader
 import scala.tools.nsc.ast.parser.xml.{MarkupParserCommon, Utility}
-import scala.reflect.internal.Chars.{ SU, LF }
+import scala.reflect.internal.Chars.SU
 
 // XXX/Note: many/most of the functions in here are almost direct cut and pastes
 // from another file - scala.xml.parsing.MarkupParser, it looks like.
@@ -261,7 +261,7 @@ trait MarkupParsers {
       def coalesce(): ArrayBuffer[Tree] = {
         def copy() = {
           val buf = new ArrayBuffer[Tree]
-          var acc = new StringBuilder
+          val acc = new StringBuilder
           var pos: Position = NoPosition
           def emit() = if (acc.nonEmpty) {
             appendText(pos, buf, acc.toString)
diff --git a/src/compiler/scala/tools/nsc/ast/parser/Parsers.scala b/src/compiler/scala/tools/nsc/ast/parser/Parsers.scala
index dac3c7a285..1d96b940ae 100644
--- a/src/compiler/scala/tools/nsc/ast/parser/Parsers.scala
+++ b/src/compiler/scala/tools/nsc/ast/parser/Parsers.scala
@@ -9,10 +9,9 @@
 package scala.tools.nsc
 package ast.parser
 
-import scala.collection.{ mutable, immutable }
-import mutable.{ ListBuffer, StringBuilder }
+import scala.collection.mutable
+import mutable.ListBuffer
 import scala.reflect.internal.{ Precedence, ModifierFlags => Flags }
-import scala.reflect.internal.Chars.{ isScalaLetter }
 import scala.reflect.internal.util.{ SourceFile, Position, FreshNameCreator, ListOfNil }
 import Tokens._
 
diff --git a/src/compiler/scala/tools/nsc/ast/parser/Scanners.scala b/src/compiler/scala/tools/nsc/ast/parser/Scanners.scala
index 51bb0d3c5b..3d8f5a2dd3 100644
--- a/src/compiler/scala/tools/nsc/ast/parser/Scanners.scala
+++ b/src/compiler/scala/tools/nsc/ast/parser/Scanners.scala
@@ -10,7 +10,7 @@ import scala.reflect.internal.util._
 import scala.reflect.internal.Chars._
 import Tokens._
 import scala.annotation.{ switch, tailrec }
-import scala.collection.{ mutable, immutable }
+import scala.collection.mutable
 import mutable.{ ListBuffer, ArrayBuffer }
 import scala.tools.nsc.ast.parser.xml.Utility.isNameStart
 import scala.language.postfixOps
diff --git a/src/compiler/scala/tools/nsc/ast/parser/SymbolicXMLBuilder.scala b/src/compiler/scala/tools/nsc/ast/parser/SymbolicXMLBuilder.scala
index 67241ef639..c3c3ee9d47 100644
--- a/src/compiler/scala/tools/nsc/ast/parser/SymbolicXMLBuilder.scala
+++ b/src/compiler/scala/tools/nsc/ast/parser/SymbolicXMLBuilder.scala
@@ -6,7 +6,7 @@
 package scala.tools.nsc
 package ast.parser
 
-import scala.collection.{ mutable, immutable }
+import scala.collection.mutable
 import symtab.Flags.MUTABLE
 import scala.reflect.internal.util.ListOfNil
 import scala.reflect.internal.util.StringOps.splitWhere
diff --git a/src/compiler/scala/tools/nsc/ast/parser/TreeBuilder.scala b/src/compiler/scala/tools/nsc/ast/parser/TreeBuilder.scala
index 6e5a3f6ef7..6b564197a1 100644
--- a/src/compiler/scala/tools/nsc/ast/parser/TreeBuilder.scala
+++ b/src/compiler/scala/tools/nsc/ast/parser/TreeBuilder.scala
@@ -7,7 +7,6 @@ package scala.tools.nsc
 package ast.parser
 
 import symtab.Flags._
-import scala.collection.mutable.ListBuffer
 import scala.reflect.internal.util.{Position, SourceFile, FreshNameCreator}
 
 /** Methods for building trees, used in the parser.  All the trees