Mutability check idea (like it's done in Rust)

[uraty]

Here is my question on stackoverflow: https://stackoverflow.com/questions/70599796/implement-annotation-processor-that-allows-to-call-method-only-if-variable-annot

As Lombok team has a lot of relevant experience maybe you will have some time to give your thoughts on this... Or even maybe you will be inspired to do it in scope of Lombok (I just dreaming...)