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But I see another case where assignment inside of expression would be helpful. 
It’s `when` expression with assignment:
<https://youtrack.jetbrains.com/issue/KT-4895>

There is a big dissussion and looks like assignment inside `when` is the best proposal imho.

Probably, if Kotlin team decide to implement this for `when` it would make sense to do also for `if`

I would use that many times already if it’d exist:)

Yes, exactly. Case with `when` looks like much more common and important than `guard` for `if`

Especialy when using ```fun test () = when () {}``` syntax:)

But for when again, I see why this is not really high priority feature. Because you can just create local variable before when

I know, it’s just a syntax sugar in this case, that you don’t have use block body