There is a lot of changes about closures calculating and generating.
1. As classes can have more than one constructor each of them should
have closure arguments.
2. Captured variables set is the same for all of them.
3. Within constructors bodies/delegating calls closure parameters
should be accessed through method arguments because fields may be
not initialized yet.
When property initializer of some inner entity (e.g. anonymous object) contains
a reference to some outer entity (say, a property of the outer class), we need
to make sure we called "lookupInContext" on this entity's owner class, so that
"setCaptureThis" was called on the appropriate closure
#KT-4176 Fixed
KT-4106: VerifyError: Can't access outer this in a lambda in inner class' constructor
KT-3152: VerifyError when accessing from a function of object to a field of outer outer class
#KT-3523 Fixed
#KT-4106 Fixed
#KT-3152 Fixed
Superclass of closures should now be FunctionImplN instead of FunctionN. Since
these -Impl classes are needed only in JVM, the corresponding descriptors and
types are created in the back-end only.
Denis Zharkov