Provide script engine rendering object with parent class loader

compiler/src/dotty/tools/repl/ScriptEngine.scala

@@ -24,7 +24,7 @@ class ScriptEngine extends AbstractScriptEngine {
       "-color:never",
       "-Xrepl-disable-display"
     ), Console.out, None)
-  private val rendering = new Rendering
+  private val rendering = new Rendering(Some(getClass.getClassLoader))
   private var state: State = driver.initialState
 
   def getFactory: ScriptEngineFactory = new ScriptEngine.Factory

tests/run-with-compiler/scripting.check

@@ -1 +1,2 @@
 42
+42

tests/run-with-compiler/scripting.scala

@@ -3,5 +3,6 @@ object Test {
     val m = new javax.script.ScriptEngineManager(getClass().getClassLoader())
     val e = m.getEngineByName("scala")
     println(e.eval("42"))
+    println(e.eval("Some(42)").asInstanceOf[Option[Int]].get)
   }
 }