MyReceiverAnnotation -> UClass (name = MyReceiverAnnotation)
name -> UAnnotationMethod (name = name)
String -> USimpleNameReferenceExpression (identifier = String)
MyReceiverAnnotation -> UAnnotation (fqName = MyReceiverAnnotation)
String -> USimpleNameReferenceExpression (identifier = String)
foo -> UMethod (name = foo)
this -> USimpleNameReferenceExpression (identifier = this)
length -> USimpleNameReferenceExpression (identifier = length)
MyReceiverAnnotation -> UAnnotation (fqName = MyReceiverAnnotation)
String -> USimpleNameReferenceExpression (identifier = String)
rx -> UMethod (name = getRx)
Regex -> USimpleNameReferenceExpression (identifier = Regex)
get -> UMethod (name = getRx)
    toRegex -> UCallExpression (kind = UastCallKind(name='method_call'), argCount = 0))
