Support interpretation of toArray for collections

compiler/ir/ir.interpreter/src/org/jetbrains/kotlin/ir/interpreter/proxy/CommonProxy.kt

@@ -80,7 +80,7 @@ internal class CommonProxy private constructor(override val state: Common, overr
                     method.name == "toString" && method.parameterTypes.isEmpty() -> commonProxy.toString()
                     else -> {
                         val irFunction = commonProxy.state.getIrFunction(method)
-                            ?: throw AssertionError("Cannot find method $method in ${commonProxy.state}")
+                            ?: return@newProxyInstance commonProxy.fallbackIfMethodNotFound(method)
                         val valueArguments = mutableListOf<Variable>()
                         valueArguments += Variable(irFunction.getDispatchReceiver()!!, commonProxy.state)
                         valueArguments += irFunction.valueParameters
@@ -90,5 +90,15 @@ internal class CommonProxy private constructor(override val state: Common, overr
                 }
             }
         }
+
+        private fun CommonProxy.fallbackIfMethodNotFound(method: java.lang.reflect.Method): Any {
+            return when {
+                method.name == "toArray" && method.parameterTypes.isEmpty() -> {
+                    val wrapper = this.state.superWrapperClass
+                    if (wrapper == null) arrayOf() else (wrapper as Collection<*>).toTypedArray()
+                }
+                else -> throw AssertionError("Cannot find method $method in ${this.state}")
+            }
+        }
     }
 }

compiler/testData/ir/interpreter/proxy/superWrapper.kt

@@ -24,6 +24,7 @@ fun test(list: MyArrayList<Int>): String {
 
     val otherList = arrayListOf(4, 5, 6)
     list.addAll(otherList)
+    list.addAll(emptyList<Int>())
     return "Counter " + list.addCounter + "; size " + list.size
 }