Remove import language.Scala2

Author: OlivierBlanvillain

compiler/src/dotty/tools/dotc/ast/Desugar.scala

@@ -472,7 +472,7 @@ object desugar {
       New(classTypeRef, vparamss.nestedMap(refOfDef))
     }
 
-    val copiedAccessFlags = if (ctx.scala2Setting) EmptyFlags else AccessFlags
+    val copiedAccessFlags = if (ctx.scala2Mode) EmptyFlags else AccessFlags
 
     // Methods to add to a case class C[..](p1: T1, ..., pN: Tn)(moreParams)
     //     def _1: T1 = this.p1

compiler/src/dotty/tools/dotc/core/TypeOps.scala

@@ -397,9 +397,6 @@ trait TypeOps { this: Context => // TODO: Make standalone object.
   def canAutoTuple: Boolean =
     !featureEnabled(defn.LanguageModuleClass, nme.noAutoTupling)
 
-  def scala2Mode: Boolean =
-    featureEnabled(defn.LanguageModuleClass, nme.Scala2)
-
   def dynamicsEnabled: Boolean =
     featureEnabled(defn.LanguageModuleClass, nme.dynamics)
 
@@ -414,7 +411,7 @@ trait TypeOps { this: Context => // TODO: Make standalone object.
   /** Is option -language:Scala2 set?
    *  This test is used when we are too early in the pipeline to consider imports.
    */
-  def scala2Setting = ctx.settings.language.value.contains(nme.Scala2.toString)
+  def scala2Mode: Boolean = ctx.settings.language.value.contains(nme.Scala2.toString)
 
   /** Refine child based on parent
    *

compiler/src/dotty/tools/dotc/parsing/Scanners.scala

@@ -242,7 +242,7 @@ object Scanners {
 
 // Scala 2 compatibility
 
-    val isScala2Mode: Boolean = ctx.scala2Setting
+    val isScala2Mode: Boolean = ctx.scala2Mode
 
     /** Cannot use ctx.featureEnabled because accessing the context would force too much */
     def testScala2Mode(msg: String, span: Span = Span(offset)): Boolean = {

compiler/src/dotty/tools/dotc/reporting/Reporter.scala

@@ -58,7 +58,7 @@ trait Reporting { this: Context =>
     if (this.settings.deprecation.value) reportWarning(new DeprecationWarning(msg, pos))
 
   def migrationWarning(msg: => Message, pos: SourcePosition = NoSourcePosition): Unit =
-    reportWarning(new MigrationWarning(msg, pos))
+    deprecationWarning(msg, pos)
 
   def uncheckedWarning(msg: => Message, pos: SourcePosition = NoSourcePosition): Unit =
     reportWarning(new UncheckedWarning(msg, pos))

compiler/test/dotty/tools/dotc/CompilationTests.scala

@@ -34,7 +34,7 @@ class CompilationTests extends ParallelTesting {
   // @Test  // enable to test compileStdLib separately with detailed stats
   def compileStdLibOnly: Unit = {
     implicit val testGroup: TestGroup = TestGroup("compileStdLibOnly")
-    compileList("compileStdLib", TestSources.stdLibSources, scala2Mode.and("-migration", "-Yno-inline", "-Ydetailed-stats"))
+    compileList("compileStdLib", TestSources.stdLibSources, scala2Mode.and("-migration", "-Yno-inline"))
   }.checkCompile()
 
   @Test def pos: Unit = {

library/src/scalaShadowing/language.scala

@@ -28,8 +28,8 @@ package scalaShadowing
  *
  *  and, for dotty:
  *
- *   - [[Scala2              `Scala2`]               backwards compatibility mode for Scala2
  *   - [[noAtoTupling        `noAutoTupling`]]       disable auto-tupling
+ *   - [[strictEquality      `strictEquality`]]      enable strick equality
  *
  *  @groupname production   Language Features
  *  @groupname experimental Experimental Language Features
@@ -211,9 +211,6 @@ object language {
     @volatile implicit lazy val macros: macros = languageFeature.experimental.macros
   }
 
-  /** Where imported, a backwards compatibility mode for Scala2 is enabled */
-  object Scala2
-
   /** Where imported, auto-tupling is disabled */
   object noAutoTupling