K2 Scripting: add support for script implicit receivers

libraries/scripting/jvm-host-test/test/kotlin/script/experimental/jvmhost/test/CachingTest.kt

@@ -110,7 +110,7 @@ class CachingTest : TestCase() {
     }
 
     @Test
-    fun testImplicitReceiversWithJarCache() = expectTestToFailOnK2 {
+    fun testImplicitReceiversWithJarCache() {
         withTempDir("scriptingTestJarCache") { cacheDir ->
             val cache = TestCompiledScriptJarsCache(cacheDir)
             Assert.assertTrue(cache.baseDir.listFiles()!!.isEmpty())

libraries/scripting/jvm-host-test/test/kotlin/script/experimental/jvmhost/test/ConstructorArgumentOrderTest.kt

@@ -24,7 +24,7 @@ class ConstructorArgumentsOrderTest {
     }
 
     @Test
-    fun testScriptWithImplicitReceiver() = expectTestToFailOnK2 {
+    fun testScriptWithImplicitReceiver() {
         val res = evalString<ScriptWithImplicitReceiver>("""println(receiverString)""") {
             implicitReceivers(ImplicitReceiverClass("Hello Receiver!"))
         }

libraries/scripting/jvm-host-test/test/kotlin/script/experimental/jvmhost/test/ScriptingHostTest.kt

@@ -223,6 +223,27 @@ class ScriptingHostTest : TestCase() {
         Assert.assertEquals(greeting, output)
     }
 
+    @Test
+    fun testSimpleScriptWithImplicitReceiver() {
+        val greeting = listOf("3")
+        val script = "println(length)"
+        val definition = createJvmScriptDefinitionFromTemplate<SimpleScriptTemplate>(
+            compilation = {
+                implicitReceivers(String::class)
+            },
+            evaluation = {
+                implicitReceivers("abc")
+            }
+        )
+        val output = captureOut {
+            val retVal = BasicJvmScriptingHost().eval(
+                script.toScriptSource(), definition.compilationConfiguration, definition.evaluationConfiguration
+            ).valueOrThrow().returnValue
+            if (retVal is ResultValue.Error) throw retVal.error
+        }.lines()
+        Assert.assertEquals(greeting, output)
+    }
+
     @Test
     fun testProvidedPropertiesNullability() = expectTestToFailOnK2 {
         val stringType = KotlinType(String::class)