JVM IR: script is a valid container for local delegated properties

When serializing metadata for local delegated properties, we need to
find a valid container class where to put it, and where kotlin-reflect
will be able to find that metadata at runtime. Taking just the closest
class lexically doesn't work, because in the attached test, it is a
class for a lambda which does not have metadata and thus does not have a
way to store any extra information.

So, in 1663619606 we started to look for the closest "non-synthetic"
class to store this metadata. But apparently it was missed that script
is a valid container class. In the test, this meant that no
non-synthetic container classes were found to store the metadata, so we
falled back to using the closest class anyway (see `?: this` in
`rememberLocalProperty`), which turned out to be the lambda.

After this change, metadata for local delegated property in a lambda
will be stored in the script class, just like it's stored in the file
class in the non-script case.

 #KT-55065 Fixed

compiler/ir/backend.jvm/lower/src/org/jetbrains/kotlin/backend/jvm/lower/PropertyReferenceLowering.kt

@@ -202,7 +202,8 @@ internal class PropertyReferenceLowering(val context: JvmBackendContext) : IrEle
 
         val localProperties = mutableListOf<IrLocalDelegatedPropertySymbol>()
         val localPropertyIndices = mutableMapOf<IrSymbol, Int>()
-        val isSynthetic = irClass.metadata !is MetadataSource.File && irClass.metadata !is MetadataSource.Class
+        val isSynthetic = irClass.metadata !is MetadataSource.File && irClass.metadata !is MetadataSource.Class &&
+                irClass.metadata !is MetadataSource.Script
 
         fun localPropertyIndex(getter: IrSymbol): Int? =
             localPropertyIndices[getter] ?: parent?.localPropertyIndex(getter)

compiler/testData/codegen/script/localDelegatedPropertyInLambda.kts

@@ -0,0 +1,17 @@
+// WITH_REFLECT
+
+import kotlin.reflect.KProperty
+
+class Delegate {
+    operator fun getValue(t: Any?, p: KProperty<*>): String =
+        if (p.returnType.toString() == "kotlin.String") "OK" else "Fail: ${p.returnType}"
+}
+
+fun f(lambda: () -> String): String = lambda()
+
+val x = f {
+    val prop: String by Delegate()
+    prop
+}
+
+// expected: x: OK

compiler/tests-common/tests/org/jetbrains/kotlin/codegen/AbstractScriptCodegenTest.java

@@ -17,25 +17,23 @@
 package org.jetbrains.kotlin.codegen;
 
 import com.intellij.openapi.util.Pair;
+import kotlin.io.FilesKt;
+import kotlin.text.Charsets;
 import org.jetbrains.annotations.NotNull;
 import org.jetbrains.kotlin.config.CompilerConfiguration;
 import org.jetbrains.kotlin.name.FqName;
 import org.jetbrains.kotlin.test.ConfigurationKind;
+import org.jetbrains.kotlin.test.InTextDirectivesUtils;
 import org.jetbrains.kotlin.utils.ExceptionUtilsKt;
 
 import java.io.File;
 import java.lang.reflect.Constructor;
 import java.lang.reflect.Field;
+import java.util.List;
 
 import static org.jetbrains.kotlin.script.ScriptTestUtilKt.loadScriptingPlugin;
 
 public abstract class AbstractScriptCodegenTest extends CodegenTestCase {
-    @Override
-    protected void setUp() throws Exception {
-        super.setUp();
-        createEnvironmentWithMockJdkAndIdeaAnnotations(ConfigurationKind.JDK_ONLY);
-    }
-
     @Override
     protected void updateConfiguration(@NotNull CompilerConfiguration configuration) {
         super.updateConfiguration(configuration);
@@ -44,6 +42,10 @@ public abstract class AbstractScriptCodegenTest extends CodegenTestCase {
 
     @Override
     protected void doTest(@NotNull String filename) {
+        configurationKind = InTextDirectivesUtils.findLinesWithPrefixesRemoved(
+                FilesKt.readText(new File(filename), Charsets.UTF_8), "// WITH_REFLECT"
+        ).isEmpty() ? ConfigurationKind.JDK_ONLY : ConfigurationKind.ALL;
+        createEnvironmentWithMockJdkAndIdeaAnnotations(configurationKind);
         loadFileByFullPath(filename);
 
         try {

compiler/tests-gen/org/jetbrains/kotlin/codegen/ScriptCodegenTestGenerated.java

@@ -90,6 +90,11 @@ public class ScriptCodegenTestGenerated extends AbstractScriptCodegenTest {
         runTest("compiler/testData/codegen/script/localDelegatedProperty.kts");
     }
 
+    @TestMetadata("localDelegatedPropertyInLambda.kts")
+    public void testLocalDelegatedPropertyInLambda() throws Exception {
+        runTest("compiler/testData/codegen/script/localDelegatedPropertyInLambda.kts");
+    }
+
     @TestMetadata("localDelegatedPropertyNoExplicitType.kts")
     public void testLocalDelegatedPropertyNoExplicitType() throws Exception {
         runTest("compiler/testData/codegen/script/localDelegatedPropertyNoExplicitType.kts");

compiler/tests-gen/org/jetbrains/kotlin/codegen/ir/IrScriptCodegenTestGenerated.java

@@ -90,6 +90,11 @@ public class IrScriptCodegenTestGenerated extends AbstractIrScriptCodegenTest {
         runTest("compiler/testData/codegen/script/localDelegatedProperty.kts");
     }
 
+    @TestMetadata("localDelegatedPropertyInLambda.kts")
+    public void testLocalDelegatedPropertyInLambda() throws Exception {
+        runTest("compiler/testData/codegen/script/localDelegatedPropertyInLambda.kts");
+    }
+
     @TestMetadata("localDelegatedPropertyNoExplicitType.kts")
     public void testLocalDelegatedPropertyNoExplicitType() throws Exception {
         runTest("compiler/testData/codegen/script/localDelegatedPropertyNoExplicitType.kts");