Support Kotlin 2+ (#10)

* Support Kotlin 2

* Upgrade junit to 4.13.2

* Resurrect embedded.gradle

Author: tianyu

build.gradle

@@ -1,6 +1,6 @@
 plugins {
     id 'java'
-    id 'org.jetbrains.kotlin.jvm' version '1.8.20'
+    id 'org.jetbrains.kotlin.jvm' version '2.0.0'
 }
 
 allprojects {

integration-test/build.gradle

@@ -7,7 +7,7 @@ plugins {
 dependencies {
     implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk8"
     implementation project('scala-module')
-    testImplementation 'junit:junit:4.12'
+    testImplementation 'junit:junit:4.13.2'
 
     kotlinCompilerPluginClasspath project(':kotlin-plugin')
 }

kotlin-plugin/build.gradle

@@ -10,7 +10,8 @@ dependencies {
     implementation "org.jetbrains.kotlin:kotlin-gradle-plugin-api"
     compileOnly "org.jetbrains.kotlin:kotlin-compiler-embeddable"
 
-    testImplementation 'com.github.tschuchortdev:kotlin-compile-testing:1.5.0'
-    testImplementation 'junit:junit:4.12'
+    // testImplementation 'com.github.tschuchortdev:kotlin-compile-testing:1.5.0' does not support Kotlin 2
+    testImplementation 'dev.zacsweers.kctfork:core:0.6.0' // Fork of kotlin-compile-testing that supports Kotlin 2
+    testImplementation 'junit:junit:4.13.2'
     testImplementation 'org.jetbrains.kotlin:kotlin-compiler-embeddable'
 }

kotlin-plugin/src/main/kotlin/me/shika/generation/ObjectSerializationIRGeneration.kt

@@ -17,7 +17,7 @@ import org.jetbrains.kotlin.ir.visitors.IrElementVisitorVoid
 import org.jetbrains.kotlin.ir.visitors.acceptChildrenVoid
 import org.jetbrains.kotlin.ir.visitors.acceptVoid
 
-private object ObjectSerializationOrigin : IrDeclarationOriginImpl("object-serialization-fix", isSynthetic = true)
+private val objectSerializationOrigin = IrDeclarationOriginImpl("object-serialization-fix", isSynthetic = true)
 
 class ObjectSerializationIrGeneration : IrGenerationExtension {
     override fun generate(moduleFragment: IrModuleFragment, pluginContext: IrPluginContext) {
@@ -37,7 +37,7 @@ class ObjectSerializationIrGeneration : IrGenerationExtension {
             name = SERIALIZABLE_READ
             returnType = context.irBuiltIns.anyNType
             visibility = DescriptorVisibilities.PUBLIC
-            origin = ObjectSerializationOrigin
+            origin = objectSerializationOrigin
         }.also { function ->
             // Ensure it is not static
             function.dispatchReceiverParameter = cls.thisReceiver?.copyTo(function)

kotlin-plugin/src/test/kotlin/me/shika/ObjectSerializationFixTest.kt

@@ -5,25 +5,13 @@ import com.tschuchort.compiletesting.SourceFile
 import org.jetbrains.kotlin.compiler.plugin.ExperimentalCompilerApi
 import org.junit.Assert.assertTrue
 import org.junit.Test
-import org.junit.runner.RunWith
-import org.junit.runners.Parameterized
-import org.junit.runners.Parameterized.Parameters
 import java.lang.reflect.Method
 
 @OptIn(ExperimentalCompilerApi::class)
-@RunWith(Parameterized::class)
-class ObjectSerializationFixTest(enableIr: Boolean, enableFir: Boolean) {
-    companion object {
-        @Parameters(name = "IR: {0}, FIR: {1}")
-        @JvmStatic
-        fun data() = arrayOf(arrayOf(false, false), arrayOf(true, false), arrayOf(true, true))
-    }
-
+class ObjectSerializationFixTest {
     private val compiler = KotlinCompilation().apply {
         compilerPluginRegistrars = listOf(ObjectSerializationCompilerPluginRegistrar())
-        useIR = enableIr
         supportsK2 = true
-        useK2 = enableFir
     }
 
     private val SERIALIZABLE_OBJECT = """