internal fun getFoo(block: (Foo.() -> Unit)): Foo {
  return Foo().apply{
    //someinit
  }.apply{
    block()
  }
…
}

getFoo{}

getFoo()

internal fun getFoo(block: (Foo.() -> Unit) = {}): Foo {
…
}

Object X { 
    fun foo() {
         Y.A()
    } 
    private fun bar() {}
   Object Y {  
          fun A() {}
   }  
   Object Z {} 
}

class Foo<T : Any>(private val valueType: KClass<T>) {
    fun getThing(): T {
        return when (valueType) {
            // complains here: "Type mismatch, required T found Int" unless I add "as T" at the end
            Integer.class -> functionThatReturnsInt()
            Double.class, etc....
        }
    }
}

import kotlin.reflect.KProperty

object Items {
    val x by SomeProperty("x")
    val y by SomeProperty("y")
    val z by SomeProperty("z")
}

fun main() {
    println("a")
    println(Items.x)
    println("b")
}

class SomeProperty(val name: String) {
    init {
        println("Property $name was created")
    }

    operator fun getValue(ref: Any?, prop: KProperty<*>) = name
}

a
Property x was created
Property y was created
Property z was created
x
b

class Something : Base(){
    override fun somethingMethod(param : String) : super(param){
        // ...etc
    }
}

Caused by: java.lang.ClassCastException: class org.apache.pulsar.client.impl.BatchMessageIdImpl cannot be cast to class kotlin.Unit (org.apache.pulsar.client.impl.BatchMessageIdImpl and kotlin.Unit are in unnamed module of loader 'app')
    at app.SomeConsumer$invoke$1.invokeSuspend(SomeConsumer.kt:40) ~[classes/:?]
    ... suppressed 5 lines

SomeConsumer:40

Unit

CompletableFuture.await()

org.apache.pulsar.client.impl.BatchMessageIdImpl

Unit

interface Idea

Closeable

.close()

.use{}

close()

@Inject

dispose()

X.dispose()

Y.foreach { it.dispose() }

.use {}