Update tests

Author: noti0na1

tests/pos-with-compiler/Patterns.scala

@@ -2,7 +2,7 @@ import dotty.tools.dotc.ast.Trees.*
 import dotty.tools.dotc.core.Types.*
 
 object Patterns {
-  val d: Object = null
+  val d: Object = Object()
   private def rebase(tp: NamedType): Type = {
     def rebaseFrom(prefix: Type): Type = ???
     tp.prefix match {

tests/pos-with-compiler/lazyValsSepComp.scala

@@ -10,7 +10,7 @@ import dotty.tools.dotc.core.Contexts.*
 
 /** A test to trigger issue with separate compilation and lazy vals */
 object Foo {
-  val definitions: Definitions = null
+  val definitions: Definitions = null.asInstanceOf[Definitions]
   def defn = definitions
   def go = defn.ScalaBoxedClasses
 }