add dummy fields to trees to test cache locality

compiler/src/dotty/tools/dotc/ast/Trees.scala

@@ -78,6 +78,24 @@ object Trees {
     /** The type  constructor at the root of the tree */
     type ThisTree[T >: Untyped] <: Tree[T]
 
+    var x1: Int = _
+    var x2: Int = _
+    var x3: Int = _
+    var x4: Int = _
+    var x5: Int = _
+    var x6: Int = _
+    var x7: Int = _
+    var x8: Int = _
+    var x9: Int = _
+    var x10: Int = _
+    var x11: Int = _
+    var x12: Int = _
+    var x13: Int = _
+    var x14: Int = _
+    var x15: Int = _
+    var x16: Int = _
+
+
     private[this] var myTpe: T = _
 
     /** Destructively set the type of the tree. This should be called only when it is known that

compiler/src/dotty/tools/dotc/printing/RefinedPrinter.scala

@@ -575,8 +575,30 @@ class RefinedPrinter(_ctx: Context) extends PlainPrinter(_ctx) {
         tree.fallbackToText(this)
     }
 
+    def toTextDummy(tree: Tree): Text = {
+      "x1 = " ~ tree.x1.toString ~ "\n" ~
+      "x2 = " ~ tree.x2.toString ~ "\n" ~
+      "x3 = " ~ tree.x3.toString ~ "\n" ~
+      "x4 = " ~ tree.x4.toString ~ "\n" ~
+      "x5 = " ~ tree.x5.toString ~ "\n" ~
+      "x6 = " ~ tree.x6.toString ~ "\n" ~
+      "x7 = " ~ tree.x7.toString ~ "\n" ~
+      "x8 = " ~ tree.x8.toString ~ "\n" ~
+      "x9 = " ~ tree.x9.toString ~ "\n" ~
+      "x10 = " ~ tree.x10.toString ~ "\n" ~
+      "x11 = " ~ tree.x11.toString ~ "\n" ~
+      "x12 = " ~ tree.x12.toString ~ "\n" ~
+      "x13 = " ~ tree.x13.toString ~ "\n" ~
+      "x14 = " ~ tree.x14.toString ~ "\n" ~
+      "x15 = " ~ tree.x15.toString ~ "\n" ~
+      "x16 = " ~ tree.x16.toString ~ "\n"
+    }
+
     var txt = toTextCore(tree)
 
+    if (ctx.settings.verbose.value)
+      txt = txt ~ "\n" ~ toTextDummy(tree)
+
     def suppressTypes =
       tree.isType || tree.isDef || // don't print types of types or defs
       homogenizedView && ctx.mode.is(Mode.Pattern)