Usages of Array.plus: return type changed.

libraries/tools/kotlin-gradle-plugin-core/src/main/kotlin/org/jetbrains/kotlin/gradle/tasks/Tasks.kt

@@ -228,7 +228,7 @@ public open class Kotlin2JsCompile() : AbstractKotlinCompile<K2JSCompilerArgumen
     }
 
     public fun addLibraryFiles(vararg fs: String) {
-        kotlinOptions.libraryFiles = (kotlinOptions.libraryFiles + (fs as Array<String>)).copyToArray()
+        kotlinOptions.libraryFiles += fs
     }
 
     public fun addLibraryFiles(vararg fs: File) {
@@ -261,7 +261,7 @@ public open class Kotlin2JsCompile() : AbstractKotlinCompile<K2JSCompilerArgumen
                         .filter { LibraryUtils.isKotlinJavascriptLibrary(it) }
                         .map { it.getAbsolutePath() }
 
-        args.libraryFiles = (kotlinOptions.libraryFiles + kotlinJsLibsFromDependencies).copyToArray()
+        args.libraryFiles = kotlinOptions.libraryFiles + kotlinJsLibsFromDependencies
         args.target = kotlinOptions.target
         args.sourceMap = kotlinOptions.sourceMap
 

libraries/tools/kotlin-gradle-plugin/src/test/kotlin/org/jetbrains/kotlin/gradle/BaseGradleIT.kt

@@ -96,7 +96,7 @@ abstract class BaseGradleIT {
 
     private fun Project.createCommand(params: Array<out String>): List<String> {
         val pathToKotlinPlugin = "-PpathToKotlinPlugin=" + File("local-repo").getAbsolutePath()
-        val tailParameters = params +
+        val tailParameters = params.asList() +
                 listOf(pathToKotlinPlugin, "--no-daemon", "--${minLogLevel.name().toLowerCase()}", "-Pkotlin.gradle.test=true")
 
         return if (isWindows())