Problem when using cage with nested memory

[IamMaxim]

I'm trying to implement basic class with mutable variable in EO. The code is:

+package sandbox
+alias stdout org.eolang.io.stdout
+alias sprintf org.eolang.txt.sprintf
+alias org.eolang.gray.cage

[] > classObject
  [] > new
    [] > @

[] > classA
  classObject > @
  [] > new
    classObject.new > super
    [] > this
      super > @
      memory > i
      [this i] > run_constructor
        seq > @
          this.i.write i
          this
      [this x] > f
        seq > @
          this.i.write x
          this
      [this y] > g
        seq > @
          this.f this (y.add 1)
          this
    seq > @
      this.i.write 0
      this
  [i] > constructor
    new > this
    seq > @
      this.run_constructor this i
      this

[args...] > app
  cage > a
  seq > @
    a.write
      classA.constructor 42
    stdout
      sprintf "%d\n" (a.i)
    a.f a 43
    stdout
      sprintf "%d\n" (a.i)
    a.g a 44
    stdout
      sprintf "%d\n" (a.i)

While this.i.write works fine in run_constructor, it fails in a.f with output:

42
Exception in thread "main" org.eolang.Attr$StillAbstractException: The attribute is not initialized, can't read
...

I played with this code for several hours, but couldn't find a way to bypass it.

[yegor256]

@IamMaxim it seems that the problem is related to this: #462 I believe, you should do a' instead of a when you call a.f with itself. Read #462, it should help.

[yegor256]

`i` shadows the attribute of the object being decorated.

[0crat]

Job gh:cqfn/eo#481 is not assigned, can't get performer