Create a scala3-library artefact

compiler/src/dotty/tools/backend/jvm/GenBCode.scala

@@ -109,7 +109,7 @@ class GenBCode extends Phase { self =>
       result
     finally
       // frontendAccess and postProcessor are created lazilly, clean them up only if they were initialized
-      if _frontendAccess ne null then
+      if !(_frontendAccess eq null) then
         frontendAccess.compilerSettings.outputDirectory match {
           case jar: JarArchive =>
             if (ctx.run.nn.suspendedUnits.nonEmpty)
@@ -120,7 +120,7 @@ class GenBCode extends Phase { self =>
             jar.close()
           case _ => ()
         }
-      if _postProcessor ne null then
+      if !(_postProcessor eq null) then
         postProcessor.classfileWriter.close()
       generatedClassHandler.close()
   }

library/src/scala/AnyVal.scala

@@ -0,0 +1,59 @@
+/*
+ * Scala (https://www.scala-lang.org)
+ *
+ * Copyright EPFL and Lightbend, Inc. dba Akka
+ *
+ * Licensed under Apache License 2.0
+ * (http://www.apache.org/licenses/LICENSE-2.0).
+ *
+ * See the NOTICE file distributed with this work for
+ * additional information regarding copyright ownership.
+ */
+/*
+package scala
+
+/** `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.
+ *
+ *  The standard implementation includes nine `AnyVal` subtypes:
+ *
+ *  [[scala.Double]], [[scala.Float]], [[scala.Long]], [[scala.Int]], [[scala.Char]],
+ *  [[scala.Short]], and [[scala.Byte]] are the ''numeric value types''.
+ *
+ *  [[scala.Unit]] and [[scala.Boolean]] are the ''non-numeric value types''.
+ *
+ *  Other groupings:
+ *
+ *   - The ''subrange types'' are [[scala.Byte]], [[scala.Short]], and [[scala.Char]].
+ *   - The ''integer types'' include the subrange types as well as [[scala.Int]] and [[scala.Long]].
+ *   - The ''floating point types'' are [[scala.Float]] and [[scala.Double]].
+ *
+ * A subclass of `AnyVal` is called a ''user-defined value class''
+ * and is treated specially by the compiler. Properly-defined user value classes provide a way
+ * to improve performance on user-defined types by avoiding object allocation at runtime, and by
+ * replacing virtual method invocations with static method invocations.
+ *
+ * User-defined value classes which avoid object allocation...
+ *
+ *   - must have a single `val` parameter that is the underlying runtime representation.
+ *   - can define `def`s, but no `val`s, `var`s, or nested `trait`s, `class`es or `object`s.
+ *   - typically extend no other trait apart from `AnyVal`.
+ *   - cannot be used in type tests or pattern matching.
+ *   - may not override `equals` or `hashCode` methods.
+ *
+ * A minimal example:
+ * {{{
+ *     class Wrapper(val underlying: Int) extends AnyVal {
+ *       def foo: Wrapper = new Wrapper(underlying * 19)
+ *     }
+ * }}}
+ *
+ * It's important to note that user-defined value classes are limited, and in some circumstances,
+ * still must allocate a value class instance at runtime. These limitations and circumstances are
+ * explained in greater detail in the [[https://docs.scala-lang.org/overviews/core/value-classes.html Value Classes and Universal Traits]].
+ */
+abstract class AnyVal extends Any {
+  def getClass(): Class[_ <: AnyVal] = null
+}
+*/

library/src/scala/AnyValCompanion.scala

@@ -0,0 +1,25 @@
+/*
+ * Scala (https://www.scala-lang.org)
+ *
+ * Copyright EPFL and Lightbend, Inc. dba Akka
+ *
+ * Licensed under Apache License 2.0
+ * (http://www.apache.org/licenses/LICENSE-2.0).
+ *
+ * See the NOTICE file distributed with this work for
+ * additional information regarding copyright ownership.
+ */
+
+package scala
+
+/** A common supertype for companion classes of primitive types.
+ *
+ *  A common trait for /companion/ objects of primitive types comes handy
+ *  when parameterizing code on types. For instance, the specialized
+ *  annotation is passed a sequence of types on which to specialize:
+ *  {{{
+ *     class Tuple1[@specialized(Unit, Int, Double) T]
+ *  }}}
+ *
+ */
+private[scala] trait AnyValCompanion extends Specializable { }

library/src/scala/App.scala

@@ -0,0 +1,104 @@
+/*
+ * Scala (https://www.scala-lang.org)
+ *
+ * Copyright EPFL and Lightbend, Inc. dba Akka
+ *
+ * Licensed under Apache License 2.0
+ * (http://www.apache.org/licenses/LICENSE-2.0).
+ *
+ * See the NOTICE file distributed with this work for
+ * additional information regarding copyright ownership.
+ */
+
+package scala
+
+import java.lang.System.{currentTimeMillis => currentTime}
+
+import scala.annotation.nowarn
+import scala.collection.mutable.ListBuffer
+
+/** The `App` trait can be used to quickly turn objects
+ *  into executable programs. Here is an example:
+ *  {{{
+ *  object Main extends App {
+ *    Console.println("Hello World: " + (args mkString ", "))
+ *  }
+ *  }}}
+ *
+ *  No explicit `main` method is needed.  Instead,
+ *  the whole class body becomes the “main method”.
+ *
+ *  `args` returns the current command line arguments as an array.
+ *
+ *  ==Caveats==
+ *
+ *  '''''It should be noted that this trait is implemented using the [[DelayedInit]]
+ *  functionality, which means that fields of the object will not have been initialized
+ *  before the main method has been executed.'''''
+ *
+ *  Future versions of this trait will no longer extend `DelayedInit`.
+ * 
+ *  In Scala 3, the `DelayedInit` feature was dropped. `App` exists only in a limited form
+ *  that also does not support command line arguments and will be deprecated in the future.
+ * 
+ *  [[https://docs.scala-lang.org/scala3/book/methods-main-methods.html @main]] methods are the
+ *  recommended scheme to generate programs that can be invoked from the command line in Scala 3.
+ * 
+ *  {{{
+ *  @main def runMyProgram(args: String*): Unit = {
+ *    // your program here
+ *  }
+ *  }}}
+ * 
+ *  If programs need to cross-build between Scala 2 and Scala 3, it is recommended to use an
+ *  explicit `main` method:
+ *  {{{
+ *  object Main {
+ *    def main(args: Array[String]): Unit = {
+ *      // your program here
+ *    }
+ *  }
+ *  }}}
+ */
+@nowarn("""cat=deprecation&origin=scala\.DelayedInit""")
+trait App extends DelayedInit {
+
+  /** The time when the execution of this program started, in milliseconds since 1
+    * January 1970 UTC. */
+  final val executionStart: Long = currentTime
+
+  /** The command line arguments passed to the application's `main` method.
+   */
+  protected final def args: Array[String] = _args
+
+  private[this] var _args: Array[String] = _
+
+  private[this] 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.
+   *  Instead it is called as compiler-generated code for those classes and objects
+   *  (but not traits) that inherit from the `DelayedInit` trait and that do not
+   *  themselves define a `delayedInit` method.
+   *  @param body the initialization code to be stored for later execution
+   */
+  @deprecated("the delayedInit mechanism will disappear", "2.11.0")
+  override def delayedInit(body: => Unit): Unit = {
+    initCode += (() => body)
+  }
+
+  /** The main method.
+   *  This stores all arguments so that they can be retrieved with `args`
+   *  and then executes all initialization code segments in the order in which
+   *  they were passed to `delayedInit`.
+   *  @param args the arguments passed to the main method
+   */
+  final def main(args: Array[String]) = {
+    this._args = args
+    for (proc <- initCode) proc()
+    if (util.Properties.propIsSet("scala.time")) {
+      val total = currentTime - executionStart
+      Console.println("[total " + total + "ms]")
+    }
+  }
+}