In short, the problem is some
platform libraries contain invalid
Kotlin code. Specifically,
some classes may inherit multiple
members with default
implementations, but do not define
an explicit override, like `UIView.bounds`.
Since we can't refactor platrofm
libraries just now, we want to
treat such properties as abstract.
^KT-65866 Fixed
^KT-65855
Allow multiple bases with default
implementations as long as there's a
non-abstract symbol from a class.
Our rules for Kotlin are stricter than
those in Java.
This annotation leads to conflicting overloads error supression,
in case where several function with the same argument types,
but different argument names are inherited from ObjC class.
We need to implement it in both K1 and K2 to make the IDE experience
better.
But the annotation itself wouldn't be available in K1.
^KT-61323
FirConstExpression is usually confused with "constant" calculations,
while in fact, it just denotes a simple literal expression
and `1 + 1` isn't represented by a FirConstExpression.
^KT-64314 Fixed
Nikolay Lunyak