scala · nicolasstucki · Feb 22, 2022 · Feb 22, 2022
diff --git a/compiler/src/dotty/tools/MainGenericRunner.scala b/compiler/src/dotty/tools/MainGenericRunner.scala
@@ -3,17 +3,16 @@ package dotty.tools
 
 import scala.annotation.tailrec
 import scala.io.Source
-import scala.util.{ Try, Success, Failure }
+import scala.util.Try
 import java.io.File
 import java.lang.Thread
 import scala.annotation.internal.sharable
 import dotty.tools.dotc.util.ClasspathFromClassloader
 import dotty.tools.runner.ObjectRunner
 import dotty.tools.dotc.config.Properties.envOrNone
-import java.util.jar._
 import dotty.tools.io.Jar
 import dotty.tools.runner.ScalaClassLoader
-import java.nio.file.{Files, Paths, Path}
+import java.nio.file.Paths
 import dotty.tools.dotc.config.CommandLineParser
 import dotty.tools.scripting.StringDriver
 

diff --git a/compiler/src/dotty/tools/backend/WorklistAlgorithm.scala b/compiler/src/dotty/tools/backend/WorklistAlgorithm.scala
@@ -1,8 +1,6 @@
 package dotty.tools
 package backend
 
-import scala.collection.mutable
-
 /**
  * Simple implementation of a worklist algorithm. A processing
  * function is applied repeatedly to the first element in the

diff --git a/compiler/src/dotty/tools/backend/jvm/BCodeAsmCommon.scala b/compiler/src/dotty/tools/backend/jvm/BCodeAsmCommon.scala
@@ -11,7 +11,7 @@ import dotty.tools.dotc.report
  * the compiler cake (Global).
  */
 final class BCodeAsmCommon[I <: DottyBackendInterface](val interface: I) {
-  import interface.{_, given}
+  import interface.given
   import DottyBackendInterface.symExtensions
 
   /**

diff --git a/compiler/src/dotty/tools/backend/jvm/BCodeBodyBuilder.scala b/compiler/src/dotty/tools/backend/jvm/BCodeBodyBuilder.scala
@@ -6,13 +6,12 @@ import scala.annotation.switch
 import scala.collection.mutable.SortedMap
 
 import scala.tools.asm
-import scala.tools.asm.{Handle, Label, Opcodes}
+import scala.tools.asm.{Handle, Opcodes}
 import BCodeHelpers.InvokeStyle
 
 import dotty.tools.dotc.ast.tpd
 import dotty.tools.dotc.CompilationUnit
 import dotty.tools.dotc.core.Constants._
-import dotty.tools.dotc.core.Decorators._
 import dotty.tools.dotc.core.Flags.{Label => LabelFlag, _}
 import dotty.tools.dotc.core.Types._
 import dotty.tools.dotc.core.StdNames.{nme, str}
@@ -915,7 +914,6 @@ trait BCodeBodyBuilder extends BCodeSkelBuilder {
         var default:  asm.Label       = null
         var indirectBlocks: List[(asm.Label, Tree)] = Nil
 
-        import scala.collection.mutable
 
         // Cases grouped by their hashCode
         val casesByHash = SortedMap.empty[Int, List[(String, Either[asm.Label, Tree])]]

diff --git a/compiler/src/dotty/tools/backend/jvm/BCodeHelpers.scala b/compiler/src/dotty/tools/backend/jvm/BCodeHelpers.scala
@@ -62,7 +62,6 @@ trait BCodeHelpers extends BCodeIdiomatic with BytecodeWriters {
   @threadUnsafe lazy val JavaAnnotationClass: ClassSymbol = requiredClass("java.lang.annotation.Annotation")
 
   val bCodeAsmCommon: BCodeAsmCommon[int.type] = new BCodeAsmCommon(int)
-  import bCodeAsmCommon._
 
   /*
    * must-single-thread
@@ -479,7 +478,7 @@ trait BCodeHelpers extends BCodeIdiomatic with BytecodeWriters {
   } // end of trait BCAnnotGen
 
   trait BCJGenSigGen {
-    import int.{_, given}
+    import int.given
 
     def getCurrentCUnit(): CompilationUnit
 

diff --git a/compiler/src/dotty/tools/backend/jvm/BCodeIdiomatic.scala b/compiler/src/dotty/tools/backend/jvm/BCodeIdiomatic.scala
@@ -4,7 +4,6 @@ package jvm
 
 import scala.tools.asm
 import scala.annotation.switch
-import scala.collection.mutable
 import Primitives.{NE, EQ, TestOp, ArithmeticOp}
 import scala.tools.asm.tree.MethodInsnNode
 import dotty.tools.dotc.report

diff --git a/compiler/src/dotty/tools/backend/jvm/BCodeSkelBuilder.scala b/compiler/src/dotty/tools/backend/jvm/BCodeSkelBuilder.scala
@@ -3,16 +3,12 @@ package backend
 package jvm
 
 import scala.collection.{ mutable, immutable }
-import scala.annotation.switch
 
 import scala.tools.asm
-import scala.tools.asm.util.{TraceMethodVisitor, ASMifier}
-import java.io.PrintWriter
 
 import dotty.tools.dotc.ast.tpd
 import dotty.tools.dotc.ast.TreeTypeMap
 import dotty.tools.dotc.CompilationUnit
-import dotty.tools.dotc.core.Annotations.Annotation
 import dotty.tools.dotc.core.Decorators._
 import dotty.tools.dotc.core.Flags._
 import dotty.tools.dotc.core.StdNames._

diff --git a/compiler/src/dotty/tools/backend/jvm/BCodeSyncAndTry.scala b/compiler/src/dotty/tools/backend/jvm/BCodeSyncAndTry.scala
@@ -9,7 +9,6 @@ import dotty.tools.dotc.CompilationUnit
 import dotty.tools.dotc.core.StdNames.nme
 import dotty.tools.dotc.core.Symbols._
 import dotty.tools.dotc.ast.tpd
-import dotty.tools.dotc.ast.tpd.TreeOps
 
 /*
  *
@@ -18,7 +17,7 @@ import dotty.tools.dotc.ast.tpd.TreeOps
  *
  */
 trait BCodeSyncAndTry extends BCodeBodyBuilder {
-  import int.{_, given}
+  import int.given
   import tpd._
   import bTypes._
   import coreBTypes._

diff --git a/compiler/src/dotty/tools/backend/jvm/BTypes.scala b/compiler/src/dotty/tools/backend/jvm/BTypes.scala
@@ -15,7 +15,7 @@ import scala.tools.asm
 abstract class BTypes {
 
   val int: DottyBackendInterface
-  import int.{_, given}
+  import int.given
   /**
    * A map from internal names to ClassBTypes. Every ClassBType is added to this map on its
    * construction.

diff --git a/compiler/src/dotty/tools/backend/jvm/BytecodeWriters.scala b/compiler/src/dotty/tools/backend/jvm/BytecodeWriters.scala
@@ -2,14 +2,11 @@ package dotty.tools
 package backend
 package jvm
 
-import java.io.{ DataOutputStream, FileOutputStream, IOException, OutputStream, File => JFile }
+import java.io.{ DataOutputStream, FileOutputStream, IOException, File as JFile }
 import java.nio.channels.ClosedByInterruptException
-import java.nio.file.Files
 import dotty.tools.io._
 import dotty.tools.dotc.report
 
-import java.util.jar.Attributes.Name
-import scala.language.postfixOps
 
 /** Can't output a file due to the state of the file system. */
 class FileConflictException(msg: String, val file: AbstractFile) extends IOException(msg)

diff --git a/compiler/src/dotty/tools/backend/jvm/CoreBTypes.scala b/compiler/src/dotty/tools/backend/jvm/CoreBTypes.scala
@@ -2,9 +2,7 @@ package dotty.tools
 package backend
 package jvm
 
-import scala.annotation.switch
 
-import dotty.tools.dotc.core.Decorators._
 import dotty.tools.dotc.core.Symbols._
 import dotty.tools.dotc.transform.Erasure
 
@@ -33,7 +31,7 @@ import dotty.tools.dotc.transform.Erasure
  */
 class CoreBTypes[BTFS <: BTypesFromSymbols[_ <: DottyBackendInterface]](val bTypes: BTFS) {
   import bTypes._
-  import int.{_, given}
+  import int.given
   import DottyBackendInterface._
 
   //import global._
@@ -212,7 +210,6 @@ trait CoreBTypesProxyGlobalIndependent[BTS <: BTypes] {
  */
 final class CoreBTypesProxy[BTFS <: BTypesFromSymbols[_ <: DottyBackendInterface]](val bTypes: BTFS) extends CoreBTypesProxyGlobalIndependent[BTFS] {
   import bTypes._
-  import bTypes.int._
 
   private var _coreBTypes: CoreBTypes[bTypes.type] = _
   def setBTypes(coreBTypes: CoreBTypes[BTFS]): Unit = {

diff --git a/compiler/src/dotty/tools/backend/jvm/DottyBackendInterface.scala b/compiler/src/dotty/tools/backend/jvm/DottyBackendInterface.scala
@@ -1,38 +1,25 @@
 package dotty.tools.backend.jvm
 
 import dotty.tools.dotc.ast.tpd
-import dotty.tools.dotc.ast.Trees
-import dotty.tools.dotc
 import dotty.tools.dotc.core.Flags._
-import dotty.tools.dotc.transform.{Erasure, GenericSignatures}
 import dotty.tools.dotc.transform.SymUtils._
 import java.io.{File => _}
 
-import scala.annotation.threadUnsafe
-import scala.collection.generic.Clearable
-import scala.collection.mutable
 import scala.reflect.ClassTag
 import dotty.tools.io.AbstractFile
-import scala.tools.asm.AnnotationVisitor
 import dotty.tools.dotc.core._
 import Contexts._
 import Types._
 import Symbols._
 import Phases._
 
-import dotty.tools.dotc.util
-import dotty.tools.dotc.util.{Spans, ReadOnlyMap}
+import dotty.tools.dotc.util.ReadOnlyMap
 import dotty.tools.dotc.report
 
-import Decorators._
-import Constants._
 import tpd._
 
-import scala.tools.asm
-import StdNames.{nme, str}
-import NameKinds.{DefaultGetterName, ExpandedName, LazyBitMapName}
-import Names.TermName
-import Annotations.Annotation
+import StdNames.nme
+import NameKinds.LazyBitMapName
 import Names.Name
 
 class DottyBackendInterface(val outputDirectory: AbstractFile, val superCallsMap: ReadOnlyMap[Symbol, Set[ClassSymbol]])(using val ctx: Context) {

diff --git a/compiler/src/dotty/tools/backend/jvm/GenBCode.scala b/compiler/src/dotty/tools/backend/jvm/GenBCode.scala
@@ -19,7 +19,6 @@ import dotty.tools.dotc.sbt.ExtractDependencies
 import Contexts._
 import Phases._
 import Symbols._
-import Decorators._
 
 import java.io.DataOutputStream
 import java.nio.channels.ClosedByInterruptException

diff --git a/compiler/src/dotty/tools/backend/jvm/scalaPrimitives.scala b/compiler/src/dotty/tools/backend/jvm/scalaPrimitives.scala
@@ -12,8 +12,6 @@ import dotc.report
 import dotc.util.ReadOnlyMap
 
 import scala.annotation.threadUnsafe
-import scala.collection.immutable
-
 
 /** Scala primitive operations are represented as methods in `Any` and
  *  `AnyVal` subclasses. Here we demultiplex them by providing a mapping

diff --git a/compiler/src/dotty/tools/backend/sjs/JSCodeGen.scala b/compiler/src/dotty/tools/backend/sjs/JSCodeGen.scala
@@ -8,28 +8,22 @@ import dotty.tools.FatalError
 
 import dotty.tools.dotc.CompilationUnit
 import dotty.tools.dotc.ast.tpd
-import dotty.tools.dotc.core.Phases.Phase
 
 import dotty.tools.dotc.core._
-import Periods._
-import SymDenotations._
 import Contexts._
 import Decorators._
 import Flags._
-import dotty.tools.dotc.ast.Trees._
 import Names._
 import NameKinds.DefaultGetterName
 import Types._
 import Symbols._
-import Denotations._
 import Phases._
 import StdNames._
 import TypeErasure.ErasedValueType
 
 import dotty.tools.dotc.transform.{Erasure, ValueClasses}
 import dotty.tools.dotc.transform.SymUtils._
 import dotty.tools.dotc.util.SourcePosition
-import dotty.tools.dotc.util.Spans.Span
 import dotty.tools.dotc.report
 
 import org.scalajs.ir
@@ -2580,7 +2574,6 @@ class JSCodeGen()(using genCtx: Context) {
   /** Gen JS code for a simple binary operation. */
   private def genSimpleBinaryOp(tree: Apply, lhs: Tree, rhs: Tree, code: Int): js.Tree = {
     import dotty.tools.backend.ScalaPrimitivesOps._
-    import js.UnaryOp._
 
     implicit val pos: SourcePosition = tree.sourcePos
 

diff --git a/compiler/src/dotty/tools/backend/sjs/JSDefinitions.scala b/compiler/src/dotty/tools/backend/sjs/JSDefinitions.scala
@@ -6,9 +6,7 @@ import scala.annotation.threadUnsafe
 import Types._
 import Contexts._
 import Symbols._
-import Names._
 import StdNames._
-import Decorators._
 
 import dotty.tools.dotc.config.SJSPlatform
 

diff --git a/compiler/src/dotty/tools/backend/sjs/JSEncoding.scala b/compiler/src/dotty/tools/backend/sjs/JSEncoding.scala
@@ -1,20 +1,12 @@
 package dotty.tools.backend.sjs
 
-import scala.annotation.tailrec
-
 import scala.collection.mutable
 
-import dotty.tools.FatalError
-
 import dotty.tools.dotc.core._
-import Decorators._
-import Periods._
-import SymDenotations._
 import Contexts._
 import Flags._
 import Types._
 import Symbols._
-import Denotations._
 import NameOps._
 import Names._
 import StdNames._
@@ -28,9 +20,6 @@ import org.scalajs.ir.OriginalName
 import org.scalajs.ir.OriginalName.NoOriginalName
 import org.scalajs.ir.UTF8String
 
-import ScopedVar.withScopedVars
-import JSDefinitions._
-
 import dotty.tools.backend.jvm.DottyBackendInterface.symExtensions
 
 /** Encoding of symbol names for JavaScript

diff --git a/compiler/src/dotty/tools/backend/sjs/JSExportsGen.scala b/compiler/src/dotty/tools/backend/sjs/JSExportsGen.scala
@@ -4,7 +4,6 @@ import scala.annotation.tailrec
 
 import scala.collection.mutable
 
-import dotty.tools.dotc.ast.Trees._
 import dotty.tools.dotc.core._
 
 import Contexts._
@@ -14,23 +13,16 @@ import Flags._
 import Names._
 import NameKinds.DefaultGetterName
 import NameOps._
-import Periods._
 import Phases._
-import StdNames._
 import Symbols._
-import SymDenotations._
 import Types._
 import TypeErasure.ErasedValueType
 
-import dotty.tools.dotc.transform.Erasure
 import dotty.tools.dotc.util.{SourcePosition, SrcPos}
-import dotty.tools.dotc.util.Spans.Span
 import dotty.tools.dotc.report
 
-import org.scalajs.ir
-import org.scalajs.ir.{ClassKind, Position, Names => jsNames, Trees => js, Types => jstpe}
-import org.scalajs.ir.Names.{ClassName, DefaultModuleID, MethodName, SimpleMethodName}
-import org.scalajs.ir.OriginalName
+import org.scalajs.ir.{Position, Names => jsNames, Trees => js, Types => jstpe}
+import org.scalajs.ir.Names.DefaultModuleID
 import org.scalajs.ir.OriginalName.NoOriginalName
 import org.scalajs.ir.Position.NoPosition
 import org.scalajs.ir.Trees.OptimizerHints

diff --git a/compiler/src/dotty/tools/backend/sjs/JSPrimitives.scala b/compiler/src/dotty/tools/backend/sjs/JSPrimitives.scala
@@ -2,7 +2,6 @@ package dotty.tools.backend.sjs
 
 import dotty.tools.dotc.core._
 import Names.TermName
-import StdNames._
 import Types._
 import Contexts._
 import Symbols._
@@ -12,8 +11,6 @@ import dotty.tools.backend.jvm.DottyPrimitives
 import dotty.tools.dotc.report
 import dotty.tools.dotc.util.ReadOnlyMap
 
-import scala.collection.mutable
-
 object JSPrimitives {
 
   inline val FirstJSPrimitiveCode = 300
@@ -60,7 +57,6 @@ object JSPrimitives {
 
 class JSPrimitives(ictx: Context) extends DottyPrimitives(ictx) {
   import JSPrimitives._
-  import dotty.tools.backend.ScalaPrimitivesOps._
 
   private lazy val jsPrimitives: ReadOnlyMap[Symbol, Int] = initJSPrimitives(using ictx)
 

diff --git a/compiler/src/dotty/tools/backend/sjs/ScopedVar.scala b/compiler/src/dotty/tools/backend/sjs/ScopedVar.scala
@@ -1,7 +1,5 @@
 package dotty.tools.backend.sjs
 
-import language.implicitConversions
-
 class ScopedVar[A](init: A) {
   import ScopedVar.Assignment
 

diff --git a/compiler/src/dotty/tools/dotc/CompilationUnit.scala b/compiler/src/dotty/tools/dotc/CompilationUnit.scala
@@ -9,7 +9,6 @@ import util.{FreshNameCreator, SourceFile, NoSource}
 import util.Spans.Span
 import ast.{tpd, untpd}
 import tpd.{Tree, TreeTraverser}
-import typer.PrepareInlineable.InlineAccessors
 import typer.Nullables
 import transform.SymUtils._
 import core.Decorators._