Removed unused imports.

A dizzying number of unused imports, limited to files
in src/compiler. I especially like that the unused import
option (not quite ready for checkin itself) finds places
where feature implicits have been imported which are no
longer necessary, e.g. this commit includes half a dozen
removals of "import scala.language.implicitConversions".

22 files changed, 4 insertions, 34 deletions

diff --git a/src/compiler/scala/tools/nsc/backend/JavaPlatform.scala b/src/compiler/scala/tools/nsc/backend/JavaPlatform.scala
index fc5d4372c5..fd4366baf1 100644
--- a/src/compiler/scala/tools/nsc/backend/JavaPlatform.scala
+++ b/src/compiler/scala/tools/nsc/backend/JavaPlatform.scala
@@ -8,7 +8,6 @@ package backend
 
 import io.AbstractFile
 import util.{ClassPath,JavaClassPath,MergedClassPath,DeltaClassPath}
-import util.ClassPath.{ JavaContext, DefaultJavaContext }
 import scala.tools.util.PathResolver
 
 trait JavaPlatform extends Platform {
diff --git a/src/compiler/scala/tools/nsc/backend/ScalaPrimitives.scala b/src/compiler/scala/tools/nsc/backend/ScalaPrimitives.scala
index 393f081f74..f6b0701f86 100644
--- a/src/compiler/scala/tools/nsc/backend/ScalaPrimitives.scala
+++ b/src/compiler/scala/tools/nsc/backend/ScalaPrimitives.scala
@@ -6,7 +6,6 @@
 package scala.tools.nsc
 package backend
 
-import scala.tools.nsc.backend.icode._
 import scala.collection.{ mutable, immutable }
 
 /** Scala primitive operations are represented as methods in `Any` and
diff --git a/src/compiler/scala/tools/nsc/backend/WorklistAlgorithm.scala b/src/compiler/scala/tools/nsc/backend/WorklistAlgorithm.scala
index 798a80ea37..93b37f415d 100644
--- a/src/compiler/scala/tools/nsc/backend/WorklistAlgorithm.scala
+++ b/src/compiler/scala/tools/nsc/backend/WorklistAlgorithm.scala
@@ -6,7 +6,6 @@
 package scala.tools.nsc
 package backend
 
-import scala.tools.nsc.ast._
 import scala.collection.{ mutable, immutable }
 
 /**
diff --git a/src/compiler/scala/tools/nsc/backend/icode/BasicBlocks.scala b/src/compiler/scala/tools/nsc/backend/icode/BasicBlocks.scala
index 068836fe4f..b62d5cb4e4 100644
--- a/src/compiler/scala/tools/nsc/backend/icode/BasicBlocks.scala
+++ b/src/compiler/scala/tools/nsc/backend/icode/BasicBlocks.scala
@@ -17,7 +17,7 @@ trait BasicBlocks {
   self: ICodes =>
 
   import opcodes._
-  import global.{ ifDebug, settings, log, nme }
+  import global.{ settings, log, nme }
   import nme.isExceptionResultName
 
   /** Override Array creation for efficiency (to not go through reflection). */
diff --git a/src/compiler/scala/tools/nsc/backend/icode/ExceptionHandlers.scala b/src/compiler/scala/tools/nsc/backend/icode/ExceptionHandlers.scala
index 2cebf7ad99..f35996eeb9 100644
--- a/src/compiler/scala/tools/nsc/backend/icode/ExceptionHandlers.scala
+++ b/src/compiler/scala/tools/nsc/backend/icode/ExceptionHandlers.scala
@@ -7,7 +7,7 @@ package scala.tools.nsc
 package backend
 package icode
 
-import scala.collection.{ mutable, immutable }
+import scala.collection.immutable
 
 /**
  * Exception handlers are pieces of code that `handle` exceptions on
diff --git a/src/compiler/scala/tools/nsc/backend/icode/GenICode.scala b/src/compiler/scala/tools/nsc/backend/icode/GenICode.scala
index 9524309e25..720896d0b3 100644
--- a/src/compiler/scala/tools/nsc/backend/icode/GenICode.scala
+++ b/src/compiler/scala/tools/nsc/backend/icode/GenICode.scala
@@ -13,7 +13,6 @@ import scala.collection.mutable.{ ListBuffer, Buffer }
 import scala.tools.nsc.symtab._
 import scala.annotation.switch
 import PartialFunction._
-import scala.language.postfixOps
 
 /** This class ...
  *
diff --git a/src/compiler/scala/tools/nsc/backend/icode/ICodes.scala b/src/compiler/scala/tools/nsc/backend/icode/ICodes.scala
index 19a700f452..7c6f2a0620 100644
--- a/src/compiler/scala/tools/nsc/backend/icode/ICodes.scala
+++ b/src/compiler/scala/tools/nsc/backend/icode/ICodes.scala
@@ -8,8 +8,6 @@ package backend
 package icode
 
 import java.io.PrintWriter
-import scala.collection.mutable
-import scala.tools.nsc.symtab._
 import analysis.{ Liveness, ReachingDefinitions }
 import scala.tools.nsc.symtab.classfile.ICodeReader
 
diff --git a/src/compiler/scala/tools/nsc/backend/icode/Linearizers.scala b/src/compiler/scala/tools/nsc/backend/icode/Linearizers.scala
index a38eab4515..b8a98955c9 100644
--- a/src/compiler/scala/tools/nsc/backend/icode/Linearizers.scala
+++ b/src/compiler/scala/tools/nsc/backend/icode/Linearizers.scala
@@ -8,7 +8,6 @@ package scala.tools.nsc
 package backend
 package icode
 
-import scala.tools.nsc.ast._
 import scala.collection.{ mutable, immutable }
 import mutable.ListBuffer
 
diff --git a/src/compiler/scala/tools/nsc/backend/icode/Members.scala b/src/compiler/scala/tools/nsc/backend/icode/Members.scala
index 7ba212f42e..07abe9d74f 100644
--- a/src/compiler/scala/tools/nsc/backend/icode/Members.scala
+++ b/src/compiler/scala/tools/nsc/backend/icode/Members.scala
@@ -7,10 +7,8 @@ package scala.tools.nsc
 package backend
 package icode
 
-import java.io.PrintWriter
 import scala.collection.{ mutable, immutable }
 import scala.reflect.internal.util.{ SourceFile, NoSourceFile }
-import symtab.Flags.{ DEFERRED }
 
 trait ReferenceEquality {
   override def hashCode = System.identityHashCode(this)
diff --git a/src/compiler/scala/tools/nsc/backend/icode/Opcodes.scala b/src/compiler/scala/tools/nsc/backend/icode/Opcodes.scala
index 8c9a72638d..796e3a5629 100644
--- a/src/compiler/scala/tools/nsc/backend/icode/Opcodes.scala
+++ b/src/compiler/scala/tools/nsc/backend/icode/Opcodes.scala
@@ -9,7 +9,6 @@ package scala.tools.nsc
 package backend
 package icode
 
-import scala.tools.nsc.ast._
 import scala.reflect.internal.util.{Position,NoPosition}
 
 /*
diff --git a/src/compiler/scala/tools/nsc/backend/icode/Printers.scala b/src/compiler/scala/tools/nsc/backend/icode/Printers.scala
index 6cac641e3e..61af6e5119 100644
--- a/src/compiler/scala/tools/nsc/backend/icode/Printers.scala
+++ b/src/compiler/scala/tools/nsc/backend/icode/Printers.scala
@@ -8,13 +8,9 @@ package backend
 package icode
 
 import java.io.PrintWriter
-import scala.tools.nsc.symtab.Flags
-import scala.reflect.internal.util.Position
 
 trait Printers { self: ICodes =>
   import global._
-  import global.icodes.opcodes._
-  import global.icodes._
 
   class TextPrinter(writer: PrintWriter, lin: Linearizer) {
     private var margin = 0
diff --git a/src/compiler/scala/tools/nsc/backend/icode/TypeKinds.scala b/src/compiler/scala/tools/nsc/backend/icode/TypeKinds.scala
index 353cc6dd0a..f96dce9f1c 100644
--- a/src/compiler/scala/tools/nsc/backend/icode/TypeKinds.scala
+++ b/src/compiler/scala/tools/nsc/backend/icode/TypeKinds.scala
@@ -140,7 +140,6 @@ trait TypeKinds { self: ICodes =>
      *  sifting through the parents for a class type.
      */
     def lub0(tk1: TypeKind, tk2: TypeKind): Type = enteringUncurry {
-      import definitions._
       val tp = global.lub(List(tk1.toType, tk2.toType))
       val (front, rest) = tp.parents span (_.typeSymbol.isTrait)
 
diff --git a/src/compiler/scala/tools/nsc/backend/icode/TypeStacks.scala b/src/compiler/scala/tools/nsc/backend/icode/TypeStacks.scala
index 23d3d05c64..c1bf4304ea 100644
--- a/src/compiler/scala/tools/nsc/backend/icode/TypeStacks.scala
+++ b/src/compiler/scala/tools/nsc/backend/icode/TypeStacks.scala
@@ -15,8 +15,6 @@ package icode
 trait TypeStacks {
   self: ICodes =>
 
-  import opcodes._
-
   /* This class simulates the type of the operand
    * stack of the ICode.
    */
diff --git a/src/compiler/scala/tools/nsc/backend/icode/analysis/TypeFlowAnalysis.scala b/src/compiler/scala/tools/nsc/backend/icode/analysis/TypeFlowAnalysis.scala
index 26363a4170..15755f31ad 100644
--- a/src/compiler/scala/tools/nsc/backend/icode/analysis/TypeFlowAnalysis.scala
+++ b/src/compiler/scala/tools/nsc/backend/icode/analysis/TypeFlowAnalysis.scala
@@ -68,7 +68,6 @@ abstract class TypeFlowAnalysis {
    *  names to types and a type stack.
    */
   object typeFlowLattice extends SemiLattice {
-    import icodes._
     type Elem = IState[VarBinding, icodes.TypeStack]
 
     val top    = new Elem(new VarBinding, typeStackLattice.top)
diff --git a/src/compiler/scala/tools/nsc/backend/jvm/BytecodeWriters.scala b/src/compiler/scala/tools/nsc/backend/jvm/BytecodeWriters.scala
index d6410cb317..8c8950d295 100644
--- a/src/compiler/scala/tools/nsc/backend/jvm/BytecodeWriters.scala
+++ b/src/compiler/scala/tools/nsc/backend/jvm/BytecodeWriters.scala
@@ -10,8 +10,7 @@ import java.io.{ DataOutputStream, FileOutputStream, OutputStream, File => JFile
 import scala.tools.nsc.io._
 import scala.tools.nsc.util.ScalaClassLoader
 import scala.tools.util.JavapClass
-import java.util.jar.{ JarEntry, JarOutputStream, Attributes }
-import Attributes.Name
+import java.util.jar.Attributes.Name
 import scala.language.postfixOps
 
 /** For the last mile: turning generated bytecode in memory into
diff --git a/src/compiler/scala/tools/nsc/backend/jvm/GenASM.scala b/src/compiler/scala/tools/nsc/backend/jvm/GenASM.scala
index 68701ddd2e..8e7b9f2ba2 100644
--- a/src/compiler/scala/tools/nsc/backend/jvm/GenASM.scala
+++ b/src/compiler/scala/tools/nsc/backend/jvm/GenASM.scala
@@ -6,12 +6,9 @@
 package scala.tools.nsc
 package backend.jvm
 
-import java.nio.ByteBuffer
 import scala.collection.{ mutable, immutable }
 import scala.reflect.internal.pickling.{ PickleFormat, PickleBuffer }
 import scala.tools.nsc.symtab._
-import scala.tools.nsc.io.AbstractFile
-
 import scala.tools.asm
 import asm.Label
 
diff --git a/src/compiler/scala/tools/nsc/backend/jvm/GenJVM.scala b/src/compiler/scala/tools/nsc/backend/jvm/GenJVM.scala
index 91796072d2..7fde3e1eaa 100644
--- a/src/compiler/scala/tools/nsc/backend/jvm/GenJVM.scala
+++ b/src/compiler/scala/tools/nsc/backend/jvm/GenJVM.scala
@@ -6,7 +6,6 @@
 package scala.tools.nsc
 package backend.jvm
 
-import java.io.{ByteArrayOutputStream, DataOutputStream, OutputStream }
 import java.nio.ByteBuffer
 import scala.collection.{ mutable, immutable }
 import scala.reflect.internal.pickling.{ PickleFormat, PickleBuffer }
@@ -16,8 +15,6 @@ import scala.reflect.internal.ClassfileConstants._
 import ch.epfl.lamp.fjbg._
 import JAccessFlags._
 import JObjectType.{ JAVA_LANG_STRING, JAVA_LANG_OBJECT }
-import java.util.jar.{ JarEntry, JarOutputStream }
-import scala.tools.nsc.io.AbstractFile
 import scala.language.postfixOps
 
 /** This class ...
diff --git a/src/compiler/scala/tools/nsc/backend/jvm/GenJVMUtil.scala b/src/compiler/scala/tools/nsc/backend/jvm/GenJVMUtil.scala
index e002a614bd..613f8f893e 100644
--- a/src/compiler/scala/tools/nsc/backend/jvm/GenJVMUtil.scala
+++ b/src/compiler/scala/tools/nsc/backend/jvm/GenJVMUtil.scala
@@ -14,7 +14,6 @@ trait GenJVMUtil {
 
   import global._
   import icodes._
-  import icodes.opcodes._
   import definitions._
 
   /** Map from type kinds to the Java reference types. It is used for
diff --git a/src/compiler/scala/tools/nsc/backend/msil/GenMSIL.scala b/src/compiler/scala/tools/nsc/backend/msil/GenMSIL.scala
index 29fc32e492..93a1252553 100644
--- a/src/compiler/scala/tools/nsc/backend/msil/GenMSIL.scala
+++ b/src/compiler/scala/tools/nsc/backend/msil/GenMSIL.scala
@@ -8,7 +8,6 @@ package scala.tools.nsc
 package backend.msil
 
 import java.io.{File, IOException}
-import java.nio.{ByteBuffer, ByteOrder}
 import scala.collection.{ mutable, immutable }
 import scala.tools.nsc.symtab._
 
@@ -312,7 +311,7 @@ abstract class GenMSIL extends SubComponent {
 
 /*    def getAttributeArgs(consts: List[Constant], nvPairs: List[(Name, Constant)]): Array[Byte] = {
       val buf = ByteBuffer.allocate(2048) // FIXME: this may be not enough!
-      buf.order(ByteOrder.LITTLE_ENDIAN)
+      buf.order(java.nio.ByteOrder.LITTLE_ENDIAN)
       buf.putShort(1.toShort) // signature
 
       def emitSerString(str: String) = {
diff --git a/src/compiler/scala/tools/nsc/backend/opt/ClosureElimination.scala b/src/compiler/scala/tools/nsc/backend/opt/ClosureElimination.scala
index 49d6e1fd4b..8d6de821bb 100644
--- a/src/compiler/scala/tools/nsc/backend/opt/ClosureElimination.scala
+++ b/src/compiler/scala/tools/nsc/backend/opt/ClosureElimination.scala
@@ -7,7 +7,6 @@ package scala.tools.nsc
 package backend.opt
 
 import scala.tools.nsc.backend.icode.analysis.LubException
-import scala.tools.nsc.symtab._
 
 /**
  *  @author Iulian Dragos
diff --git a/src/compiler/scala/tools/nsc/backend/opt/DeadCodeElimination.scala b/src/compiler/scala/tools/nsc/backend/opt/DeadCodeElimination.scala
index 5aa6e0f2da..f7e743a6f1 100644
--- a/src/compiler/scala/tools/nsc/backend/opt/DeadCodeElimination.scala
+++ b/src/compiler/scala/tools/nsc/backend/opt/DeadCodeElimination.scala
@@ -8,7 +8,6 @@ package scala.tools.nsc
 package backend.opt
 
 import scala.collection.{ mutable, immutable }
-import symtab._
 
 /**
  */
diff --git a/src/compiler/scala/tools/nsc/backend/opt/InlineExceptionHandlers.scala b/src/compiler/scala/tools/nsc/backend/opt/InlineExceptionHandlers.scala
index ab238af239..c534c2230c 100644
--- a/src/compiler/scala/tools/nsc/backend/opt/InlineExceptionHandlers.scala
+++ b/src/compiler/scala/tools/nsc/backend/opt/InlineExceptionHandlers.scala
@@ -4,7 +4,6 @@
 
 package scala.tools.nsc
 package backend.opt
-import scala.util.control.Breaks._
 
 /**
   * This optimization phase inlines the exception handlers so that further phases can optimize the code better