`when` should change the scope so you can call fun...

# language-proposals

[benleggiero]

when should change the scope so you can call functions on the parameter.

Like, I wish when was declared like:

fun <T, R> when(target: T, block: T.()->R): R

So you could use it like:

return when(str) {
    equals("foo") -> foo()
    contains("bar") -> baz()
}