Drop @mixin annotation

For the moment, keep it in src-non-bootstrapped

Author: odersky

library/src-bootstrapped/scala/reflect/Enum.scala

@@ -0,0 +1,7 @@
+package scala.reflect
+
+/** A base trait of all Scala enum definitions */
+transparent trait Enum extends Any, Product, Serializable:
+
+  /** A number uniquely identifying a case of an enum */
+  def ordinal: Int

library/src-bootstrapped/scala/runtime/EnumValue.scala

@@ -0,0 +1,9 @@
+package scala.runtime
+
+transparent trait EnumValue extends Product, Serializable:
+  override def canEqual(that: Any) = this eq that.asInstanceOf[AnyRef]
+  override def productArity: Int = 0
+  override def productElement(n: Int): Any =
+    throw IndexOutOfBoundsException(n.toString)
+  override def productElementName(n: Int): String =
+    throw IndexOutOfBoundsException(n.toString)

library/src/scala/annotation/mixin.scala renamed to library/src-non-bootstrapped/scala/annotation/mixin.scala

@@ -1,4 +1,3 @@
-import annotation.mixin
 transparent sealed trait TA
 transparent sealed trait TB
 trait S

library/src/scala/reflect/Enum.scala renamed to library/src-non-bootstrapped/scala/reflect/Enum.scala

@@ -1,4 +1,3 @@
-import annotation.mixin
 transparent trait S
 trait A
 class B extends A, S