See `checkStatementType`, we return `null` to reduce count of errors.
Also, note that named function which is used as last statement in lambda
doesn't coerce to Unit, this is a separate bug and will be addressed later,
see #KT-25383
#EA-121026 Fixed
It's needed when declarations are parsed as a part of previous expression
(see tests)
Currently we apply this kind of recovery in a conservative way,
only when declaration starts at the next line, and while
the condition could be relaxed, there's no need to do this
#KT-4948 Fixed
#KT-7118 Fixed
Mikhail Zarechenskiy