EXTENSION_RECEIVER
Extension receiver of an extension function or property.
© 2010–2018 JetBrains s.r.o.
Licensed under the Apache License, Version 2.0.
https://kotlinlang.org/api/latest/jvm/stdlib/kotlin.reflect/-k-parameter/-kind/-e-x-t-e-n-s-i-o-n_-r-e-c-e-i-v-e-r.html