1 files changed, 7 insertions, 6 deletions
diff --git a/src/dotty/tools/dotc/core/pickling/TreeUnpickler.scala b/src/dotty/tools/dotc/core/pickling/TreeUnpickler.scala
index ba3023ed1..7b143dfad 100644
--- a/src/dotty/tools/dotc/core/pickling/TreeUnpickler.scala
+++ b/src/dotty/tools/dotc/core/pickling/TreeUnpickler.scala
@@ -338,7 +338,7 @@ class TreeUnpickler(reader: TastyReader, tastyName: TastyName.Table) {
           name.isTermName && !name.isConstructorName && !givenFlags.is(ParamOrAccessor) ||
         isAbstractType
       var flags = givenFlags
-      if (lacksDefinition) flags |= Deferred
+      if (lacksDefinition && tag != PARAM) flags |= Deferred
       if (tag == DEFDEF) flags |= Method
       if (givenFlags is Module)
         flags = flags | (if (tag == VALDEF) ModuleCreationFlags else ModuleClassCreationFlags)
@@ -860,11 +860,12 @@ class TreeUnpickler(reader: TastyReader, tastyName: TastyName.Table) {
     }
   }
 
-  private def setNormalized(tree: Tree, parentPos: Position): Unit = {
-    assert(tree.pos.exists)
-    val absPos = Position(parentPos.start + offsetToInt(tree.pos.start), parentPos.end - tree.pos.end)
-    tree.setPosUnchecked(absPos)
-  }
+  private def setNormalized(tree: Tree, parentPos: Position): Unit =
+    tree.setPosUnchecked(
+      if (tree.pos.exists)
+        Position(parentPos.start + offsetToInt(tree.pos.start), parentPos.end - tree.pos.end)
+      else
+        parentPos)
 
   def normalizePos(x: Any, parentPos: Position)(implicit ctx: Context): Unit =
     traverse(x, parentPos, setNormalized)