Inner class constructors should use the argument instead of reading
outer `this` from a field because if such an access happens before a
delegating constructor call, e.g. when evaluating an argument, a JVM
bytecode validation error will be thrown. (The only operation on `this`
allowed before a delegating constructor call is SETFIELD, and only if
the field in question is declared in the same class.)
This change reverts the AssignmentTranslator logic to a previous state
of "if we assign to a val, tranlate to backing field". Previously a
check whether or not we are inside of a constructor was added. The
check didn't detect secondary constructors, hence initializing of
val's with backing field started to work incorrectly.
The check itself was added in an attempt to prevent augmented assignment
operators to reference the backing field. The check seems to have been
wrong, because an augmented assignment could happen inside a construcotr.
A more correct fix was added later. It seems that it is safe now to
revert the logic back and rely on the frontend to only allow assignment
to a val property during initilization.
- locals win
- unary calls to plus/minus are not supported in favor of unaryPlus/unaryMinus
- unqualified nested classes are temporarily reported as unresolved
- function without receiver win against extension function
- explicit import win against star import
It's need to add synthetic argument (of type that user can't use)
to constructors with default arguments to avoid clashing with
real user's constructor having the same set of parameters
and additional int's arguments.
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.
Mikhael Bogdanov