Pass annotations and fix transient lazy vals bug

Author: szymon-rd

compiler/src/dotty/tools/dotc/transform/LazyVals.scala

@@ -462,6 +462,7 @@ class LazyVals extends MiniPhase with IdentityDenotTransformer {
     val containerName = LazyLocalName.fresh(x.name.asTermName)
     val containerSymbol = newSymbol(claz, containerName, containerFlags, defn.ObjectType).enteredAfter(this)
     containerSymbol.addAnnotation(Annotation(defn.VolatileAnnot)) // private @volatile var _x: AnyRef
+    containerSymbol.addAnnotations(x.symbol.annotations) // pass annotations from original definition
     val stat = x.symbol.isStatic
     if stat then
       containerSymbol.setFlag(JavaStatic)

tests/run/serialization-new.check

@@ -224,7 +224,11 @@ x = Paul
 y = Paul
 x equals y: true, y equals x: true
 
+Calculating a1
 1
+Calculating a2
 2
+Calculating a1
 1
+Calculating a2
 2

tests/run/serialization-new.scala

@@ -468,8 +468,14 @@ object Test7 {
 
 // Verify that transient lazy vals don't get serialized
 class WithTransient extends Serializable {
-  @transient lazy val a1 = 1
-  @transient private lazy val a2 = 2
+  @transient lazy val a1 = {
+    println("Calculating a1")
+    1
+  }
+  @transient private lazy val a2 = {
+    println("Calculating a2")
+    2
+  }
   @transient object B extends Serializable
   @transient private object C extends Serializable