E.g. a statement like
var x by ::y
is semantically equivalent to
var x
get() = y
set(value) { y = value }
and thus does not need a full property reference object, or even a field
if the receiver is not bound.
#KT-39054 Fixed
#KT-47102 Fixed
Like function arguments, they are context-dependent, but unlike function
arguments, callable references should be resolved eagerly as if they are
explicit receivers.