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val value: T

when(value) {
  is String -> ...
  is Int -> ...
  else -> ...
}

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enum class HttpStatusCode(val value: Int) {
    Default(0),

    Continue(100),
    SwitchingProtocols(101),
    Processing(102),

    Ok(200),
    Created(201),
    Accepted(202),

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// Not object class. AndroidManifest.xml error happen.
class MainApplication : Application() {

    init {
        instance = this
    }

    companion object {
        private var instance: MainApplication? = null

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dependencies {
  compile "org.jetbrains.kotlin:kotlin-reflect:$kotlin_version"
}

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// recommend class.java.simpleName is not wrapped
private val LogTag = MainActivity::class.java.simpleName

// deprecate class.simpleName is wrapped.
private val LogTag = MainActivity::class.simpleName

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※It might not work...
※I tried Parceler and PaperParcel, But I don't use Parcelable Library by Kotlin.

1. Remove apply plugin: 'com.neenbedankt.android-apt'
2. Change dependencies kapt to apt 

dependencies {
    …
    kapt 'com.github.grandstaish.paperparcel:compiler:1.0.0'
    ↓

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Quit Android Studio
Android Studio → Tools → Kotlin → Configure Kotlin in Project
Clean build
😰

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class KotlinCustomView
@JvmOverloads constructor(context: Context, attrs: AttributeSet? = null, defStyleAttr: Int = 0) : View(context, attrs, defStyleAttr)

class KotlinCustomView: View {

    // Basic constructors
    constructor(context: Context) : super(context)
    constructor(context: Context, attrs: AttributeSet) : super(context, attrs)
    constructor(context: Context, attrs: AttributeSet, defStyle: Int) : super(context, attrs, defStyle)