Rule 5.2.1 The lambda parameter of the function should be placed in the last place in the argument list

[petertrr]

With a such notation it is easier to use curly brackets, code becoming more readable.
Good example:

// declaration
fun myFoo(someArg: Int, myLambda: () -> Unit) {
// ...
}

// usage
myFoo(1) { 
println("hey")
}

[petertrr]

I think we should also clarify how to handle functions with several lambda arguments.