Grammar: inconsistency with in vs &&

[belyaev-mikhail]

In actual kotlin, the following code has different priority:

when (x) {
       in y && z -> /* parsed as in (y && z) */
}

when {
      x in y && z -> /*  parsed as (x in y) && z */
}

We need to recheck it against the grammar

[belyaev-mikhail]

Works as intended