in src/main/scala/kotlin/KotlinCompile.scala [22:26]
4 lines of code
1 McCabe index (conditional complexity)
private def memoize[K, V](f: K => V): K => V = {
val cache = new java.util.concurrent.ConcurrentHashMap[K, V]()
// don't inline
cache.computeIfAbsent(_, f(_))
}