Two fixes to pickling and unpickling of untyped trees

 - Fix pickling of untyped templates
 - Fix unpickling of TypeBoundsTrees

Author: odersky

compiler/src/dotty/tools/dotc/core/tasty/TreePickler.scala

@@ -798,12 +798,14 @@ class TreePickler(pickler: TastyPickler) {
         pickleDef(OBJECTDEF, tree, tree.impl)
       case tree: untpd.Template =>
         writeByte(TEMPLATE)
-        tree.parents.foreach(pickleParent)
-        if (!tree.self.isEmpty) {
-          writeByte(SELFDEF); pickleName(tree.self.name); pickleTpt(tree.self.tpt)
+        withLength {
+          tree.parents.foreach(pickleParent)
+          if (!tree.self.isEmpty) {
+            writeByte(SELFDEF); pickleName(tree.self.name); pickleTpt(tree.self.tpt)
+          }
+          pickleUntyped(tree.constr)
+          tree.body.foreach(pickleUntyped)
         }
-        pickleUntyped(tree.constr)
-        tree.body.foreach(pickleUntyped)
       case Import(expr, selectors) =>
         writeByte(IMPORT)
         withLength { pickleUntyped(expr); pickleSelectors(selectors) }

compiler/src/dotty/tools/dotc/core/tasty/TreeUnpickler.scala

@@ -1365,7 +1365,7 @@ class TreeUnpickler(reader: TastyReader,
             untpd.LambdaTypeTree(tparams, body)
           case TYPEBOUNDStpt =>
             val lo = readUntyped()
-            val hi = ifBefore(end)(lo, readUntyped())
+            val hi = ifBefore(end)(readUntyped(), lo)
             untpd.TypeBoundsTree(lo, hi)
           case TYPEDSPLICE =>
             untpd.TypedSplice(readTerm())

tests/pickling/transparent.scala

@@ -0,0 +1,9 @@
+class Foo {
+  transparent def foo() = {
+    abstract class C[T] extends Object {
+      def x: T
+      println(x)
+    }
+    ()
+  }
+}