Generally the wrapping anonymous initializer can be used as a
"containing declaration" for some elements, but since the initialiser
for the last script expression could be dropped (the expression could
be converted to the result property), this may lead to the surprises,
e.g. as described in KT-65984
This fix marks the last initialiser as local, preventing it from being
referenced as "containing declaration".
#KT-65984
Ilya Chernikov