Support lazy val in Scala 3

gradle/libs.versions.toml

@@ -9,6 +9,7 @@ idea = "2020.1.4"
 idea-scala = "2020.1.43"
 maven = "3.5.4"
 maven-tools = "3.7.1"
+scala = "3.4.0"
 
 
 [libraries]
@@ -47,6 +48,8 @@ maven-core = { module = "org.apache.maven:maven-core", version.ref = "maven" }
 maven-embedder = { module = "org.apache.maven:maven-embedder", version.ref = "maven" }
 maven-compat = { module = "org.apache.maven:maven-compat", version.ref = "maven" }
 
+scala-library = { module = "org.scala-lang:scala3-library_3", version.ref = "scala" }
+
 [libraries.maven-plugin-tools-api]
 module = "org.apache.maven.plugin-tools:maven-plugin-tools-api"
 version.ref = "maven-tools"

tests/build.gradle.kts

@@ -16,6 +16,7 @@
 
 plugins {
     `java-library`
+    scala
 }
 
 description = "Tests"
@@ -43,6 +44,7 @@ dependencies {
     testImplementation(libs.rhino)
     testImplementation(libs.junit)
     testImplementation(libs.testng)
+    testImplementation(libs.scala.library)
 }
 
 tasks.test {

tests/src/test/scala/org/teavm/scala/LazyValueTest.scala

@@ -0,0 +1,23 @@
+package org.teavm.scala
+
+import org.junit.Test
+import org.junit.runner.RunWith
+import org.teavm.junit.TeaVMTestRunner
+import org.junit.Assert.assertEquals
+
+@RunWith(classOf[TeaVMTestRunner])
+class LazyValueTest {
+  private var value: Int = 0
+
+  private lazy val lazyValue: Int = {
+    value += 1
+    23
+  }
+
+  @Test
+  def lazyValueSupport(): Unit = {
+    assertEquals(0, value)
+    assertEquals(23, lazyValue)
+    assertEquals(1, value)
+  }
+}