Drop dotty.language from Definitions

Author: odersky

src/dotty/tools/dotc/core/Definitions.scala

@@ -430,10 +430,8 @@ class Definitions {
     def Product_productArity(implicit ctx: Context) = Product_productArityR.symbol
     lazy val Product_productPrefixR = ProductClass.requiredMethodRef(nme.productPrefix)
     def Product_productPrefix(implicit ctx: Context) = Product_productPrefixR.symbol
-  lazy val LanguageModuleRef = ctx.requiredModule("dotty.language")
+  lazy val LanguageModuleRef = ctx.requiredModule("scala.language")
   def LanguageModuleClass(implicit ctx: Context) = LanguageModuleRef.symbol.moduleClass.asClass
-  lazy val Scala2LanguageModuleRef = ctx.requiredModule("scala.language")
-  def Scala2LanguageModuleClass(implicit ctx: Context) = Scala2LanguageModuleRef.symbol.moduleClass.asClass
   lazy val NonLocalReturnControlType: TypeRef   = ctx.requiredClassRef("scala.runtime.NonLocalReturnControl")
 
   lazy val ClassTagType = ctx.requiredClassRef("scala.reflect.ClassTag")

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

@@ -517,7 +517,7 @@ trait TypeOps { this: Context => // TODO: Make standalone object.
    */
   def featureEnabled(owner: ClassSymbol, feature: TermName): Boolean = {
     def toPrefix(sym: Symbol): String =
-      if (!sym.exists || (sym eq defn.LanguageModuleClass) || (sym eq defn.Scala2LanguageModuleClass)) ""
+      if (!sym.exists || (sym eq defn.LanguageModuleClass)) ""
       else toPrefix(sym.owner) + sym.name + "."
     def featureName = toPrefix(owner) + feature
     def hasImport(implicit ctx: Context): Boolean = {
@@ -536,13 +536,13 @@ trait TypeOps { this: Context => // TODO: Make standalone object.
 
   /** Is auto-tupling enabled? */
   def canAutoTuple =
-    !featureEnabled(defn.Scala2LanguageModuleClass, nme.noAutoTupling)
+    !featureEnabled(defn.LanguageModuleClass, nme.noAutoTupling)
 
   def scala2Mode =
     featureEnabled(defn.LanguageModuleClass, nme.Scala2)
 
   def dynamicsEnabled =
-    featureEnabled(defn.Scala2LanguageModuleClass, nme.dynamics)
+    featureEnabled(defn.LanguageModuleClass, nme.dynamics)
 
   def testScala2Mode(msg: String, pos: Position) = {
     if (scala2Mode) migrationWarning(msg, pos)

tests/pos/intersection.scala

@@ -1,4 +1,3 @@
-import dotty.language.keepUnions
 object intersection {
 
   class A