Hi Dale,
It’s been added recently to the standard library as “apply”.
See: https://github.com/JetBrains/kotlin/blob/master/libraries/stdlib/src/kotlin/util/Standard.kt#L29
So I guess it will be available in M13.
In a strange convergence, I added it to my own commons library a few days ago: https://github.com/andrewoma/kommon/commit/7746e76f22cc2b8359c28c0697bb6957abc8e1b0
Cheers,
Andrew