code: def test_pass_context_loop_vars(self, env):
      @pass_context
      def test(ctx):
          return f"{ctx['i']}{ctx['j']}"
  
      tmpl = env.from_string(
          """\
  {% set i = 42 %}
  {%- for idx in range(2) -%}
  {{ i }}{{ j }}
  {% set i = idx -%}
  {%- set j = loop.index -%}
  {{ test() }}
  {{ i }}{{ j }}
  {% endfor -%}
  {{ i }}{{ j }}"""
      )
      tmpl.globals["test"] = test
      assert tmpl.render() == "42\n01\n01\n42\n12\n12\n42"
  
imports: import pytest
  from jinja2 import DictLoader
  from jinja2 import Environment
  from jinja2 import PrefixLoader
  from jinja2 import Template
  from jinja2 import TemplateAssertionError
  from jinja2 import TemplateNotFound
  from jinja2 import TemplateSyntaxError
  from jinja2.utils import pass_context
label_desc: Use image node_id 42 for calling the TestBug obj's underlying member method code with example usage: obj.test_pass_context_loop_vars(env) and returns: ctx, ctx