@Override
public boolean isAssignable(AnnotatedTypeMirror varType, Tree varTree) {
if (varTree.getKind() == Tree.Kind.VARIABLE || varType.hasAnnotation(ASSIGNABLE)) return true;
Element varElement = InternalUtils.symbol(varTree);
if (varElement == null || !varElement.getKind().isField() || ElementUtils.isStatic(varElement))
return true;
ExpressionTree expTree = (ExpressionTree) varTree;
AnnotatedTypeMirror receiver = factory.getReceiver(expTree);
boolean isAssignable =
receiver.hasAnnotation(MUTABLE)
|| (receiver.hasAnnotation(ASSIGNS_FIELDS) && TreeUtils.isSelfAccess(expTree));
return isAssignable;
}
