chore: add scala.language.2 to files in scala

Author: hamzaremmal

library/src/scala/AnyVal.scala

@@ -12,6 +12,8 @@
 
 package scala
 
+import scala.language.`2`
+
 /** `AnyVal` is the root class of all ''value types'', which describe values
  *  not implemented as objects in the underlying host system. Value classes
  *  are specified in Scala Language Specification, section 12.2.

library/src/scala/AnyValCompanion.scala

@@ -12,6 +12,8 @@
 
 package scala
 
+import scala.language.`2`
+
 /** A common supertype for companion classes of primitive types.
  *
  *  A common trait for /companion/ objects of primitive types comes handy

library/src/scala/App.scala

@@ -14,6 +14,8 @@ package scala
 
 import java.lang.System.{currentTimeMillis => currentTime}
 
+import scala.language.`2`
+
 import scala.annotation.nowarn
 import scala.collection.mutable.ListBuffer
 
@@ -71,9 +73,9 @@ trait App extends DelayedInit {
    */
   protected final def args: Array[String] = _args
 
-  private[this] var _args: Array[String] = _
+  private var _args: Array[String] = compiletime.uninitialized
 
-  private[this] val initCode = new ListBuffer[() => Unit]
+  private val initCode = new ListBuffer[() => Unit]
 
   /** The init hook. This saves all initialization code for execution within `main`.
    *  This method is normally never called directly from user code.

library/src/scala/Array.scala

@@ -12,6 +12,8 @@
 
 package scala
 
+import scala.language.`2`
+
 //import scala.collection.generic._
 import scala.collection.{Factory, immutable, mutable}
 import mutable.ArrayBuilder
@@ -149,7 +151,7 @@ object Array {
     *
     * @see `java.util.Arrays#copyOf`
     */
-  def copyAs[A](original: Array[_], newLength: Int)(implicit ct: ClassTag[A]): Array[A] = {
+  def copyAs[A](original: Array[?], newLength: Int)(implicit ct: ClassTag[A]): Array[A] = {
     val runtimeClass = ct.runtimeClass
     if (runtimeClass == Void.TYPE) newUnitArray(newLength).asInstanceOf[Array[A]]
     else {

library/src/scala/Boolean.scala

@@ -16,6 +16,8 @@
 
 package scala
 
+import scala.language.`2`
+
 /** `Boolean` (equivalent to Java's `boolean` primitive type) is a
  *  subtype of [[scala.AnyVal]]. Instances of `Boolean` are not
  *  represented by an object in the underlying runtime system.

library/src/scala/Byte.scala

@@ -16,6 +16,8 @@
 
 package scala
 
+import scala.language.`2`
+
 /** `Byte`, a 8-bit signed integer (equivalent to Java's `byte` primitive type) is a
  *  subtype of [[scala.AnyVal]]. Instances of `Byte` are not
  *  represented by an object in the underlying runtime system.

library/src/scala/Char.scala

@@ -16,6 +16,8 @@
 
 package scala
 
+import scala.language.`2`
+
 /** `Char`, a 16-bit unsigned integer (equivalent to Java's `char` primitive type) is a
  *  subtype of [[scala.AnyVal]]. Instances of `Char` are not
  *  represented by an object in the underlying runtime system.

library/src/scala/Console.scala

@@ -12,6 +12,8 @@
 
 package scala
 
+import scala.language.`2`
+
 import java.io.{ BufferedReader, InputStream, InputStreamReader, OutputStream, PrintStream, Reader }
 import scala.io.AnsiColor
 import scala.util.DynamicVariable

library/src/scala/DelayedInit.scala

@@ -12,6 +12,8 @@
 
 package scala
 
+import scala.language.`2`
+
 /** Classes and objects (but note, not traits) inheriting the `DelayedInit`
  *  marker trait will have their initialization code rewritten as follows:
  *  `code` becomes `delayedInit(code)`.

library/src/scala/Double.scala

@@ -16,6 +16,8 @@
 
 package scala
 
+import scala.language.`2`
+
 /** `Double`, a 64-bit IEEE-754 floating point number (equivalent to Java's `double` primitive type) is a
  *  subtype of [[scala.AnyVal]]. Instances of `Double` are not
  *  represented by an object in the underlying runtime system.