The problem is that delegated properties resolve two calls together:
`getValue`/`setValue` with a common receiver, which can contain
callable references. For each completion new anonymous descriptor
was created and caused "rewrite at slice" exceptions later.
Now there is a little hack to check that during one inference session
we don't complete one call more than one time.
More correct fix would be to explicitly specify common receiver for
inference session but it requires quite big refactoring, which will
be done later with a whole refactoring of the common solver
#KT-30250 Fixed
Victor Petukhov