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kotlinlang

<@U0B8SM5FX>: Though I do think `if-let` is a useful construct I think the added value to a language like Kotlin is minimal. For Swift this construct is somewhat a necessity as it actually lacks `null/nil`  in some sense. Every nullable type in Swift is actually an Option type (so with none-some) on which you can pattern match:
```
switch foo{
case .None:
    //
case let a:
    //
}
``` 
(since 2.0 you can match `nil` for readability sake). If-let is the easy way to unwrap the value of that type. In Kotlin we don't need to unwrap, we just need to check whether something is `null`, autocasting does the rest. And yes I do realize there are a couple of cases/snippets that really can leverage an if-let construct, e.g.:
```
fun foo() : Foo? = ....
...
if (let a = foo())
  //got foo
else
  //no foo :-)
```
I think the gain here is minimal, but maybe I'm missing important use-cases? What do you think?