this is what happens

if_i_use.toml

type = "Module"
name = "fib_generator"

[[content]]
type = "DefStmt"
kw_args = [ ]

  [content.name]
  type = "Ident"
  name = "fibs"

  [[content.args]]
  type = "Ident"
  name = "n"

  [content.content]
  type = "Block"

    [[content.content.content]]
    type = "DefStmt"
    kw_args = [ ]

      [content.content.content.name]
      type = "Ident"
      name = "fib"

      [[content.content.content.args]]
      type = "Ident"
      name = "n"

      [content.content.content.content]
      type = "Block"

        [[content.content.content.content.content]]
        type = "IfStmt"

          [[content.content.content.content.content.branches]]
          type = "If"

            [content.content.content.content.content.branches.condition]
            type = "CmpExpr"
            op = "Leq"

              [[content.content.content.content.content.branches.condition.values]]
              type = "Ident"
              name = "n"

              [[content.content.content.content.content.branches.condition.values]]
              type = "Literal"
              value = "1"

            [content.content.content.content.content.branches.content]
            type = "Block"

              [[content.content.content.content.content.branches.content.content]]
              type = "ReturnStmt"

                [content.content.content.content.content.branches.content.content.value]
                type = "Ident"
                name = "n"

        [[content.content.content.content.content]]
        type = "ReturnStmt"

          [content.content.content.content.content.value]
          type = "MathExpr"
          op = "Add"

            [[content.content.content.content.content.value.values]]
            type = "CallStmt"
            kw_args = [ ]

              [content.content.content.content.content.value.values.base]
              type = "Ident"
              name = "fib"

              [[content.content.content.content.content.value.values.args]]
              type = "MathExpr"
              op = "Sub"

                [[content.content.content.content.content.value.values.args.values]]
                type = "Ident"
                name = "n"

                [[content.content.content.content.content.value.values.args.values]]
                type = "Literal"
                value = "1"

            [[content.content.content.content.content.value.values]]
            type = "CallStmt"
            kw_args = [ ]

              [content.content.content.content.content.value.values.base]
              type = "Ident"
              name = "fib"

              [[content.content.content.content.content.value.values.args]]
              type = "MathExpr"
              op = "Sub"

                [[content.content.content.content.content.value.values.args.values]]
                type = "Ident"
                name = "n"

                [[content.content.content.content.content.value.values.args.values]]
                type = "Literal"
                value = "2"

    [[content.content.content]]
    type = "ForStmt"

      [[content.content.content.iter_vals]]
      type = "Ident"
      name = "i"

      [content.content.content.iter_subj]
      type = "CallStmt"
      kw_args = [ ]

        [content.content.content.iter_subj.base]
        type = "Ident"
        name = "range"

        [[content.content.content.iter_subj.args]]
        type = "Ident"
        name = "n"

      [content.content.content.content]
      type = "Block"

        [[content.content.content.content.content]]
        type = "YieldStmt"

          [content.content.content.content.content.value]
          type = "CallStmt"
          kw_args = [ ]

            [content.content.content.content.content.value.base]
            type = "Ident"
            name = "fib"

            [[content.content.content.content.content.value.args]]
            type = "MathExpr"
            op = "Add"

              [[content.content.content.content.content.value.args.values]]
              type = "Ident"
              name = "i"

              [[content.content.content.content.content.value.args.values]]
              type = "Literal"
              value = "1"