code: def get_stack_var(name, depth=0):
      '''This function may fiddle with the locals of the calling function,
      to make it the root function of the fiber. If called from a short-lived
      function be sure to use a bigger frame depth.
      Returns the fiber state or None.'''
  
      base_frame = _get_base_frame(depth)
      if not base_frame:
          # Frame not found
          raise RuntimeError("Base frame not found")
  
      # Lookup up the frame stack starting at the base frame for the fiber state
      level = 0
      frame = base_frame
      while frame:
          locals = frame.f_locals
          value = locals.get(name)
          if value is not None:
              if level > 0:
                  # Copy a reference of the fiber state in the base frame
                  base_frame.f_locals[name] = value
              return value
          if locals.get(SECTION_BOUNDARY_TAG):
              return None
          frame = frame.f_back
          level += 1
      return Nonf get_stack_var(name, depth=0):
      '''This function may fiddle with the locals of the calling function,
      to make it the root function of the fiber. If called from a short-lived
      function be sure to use a bigger frame depth.
      Returns the fiber state or None.'''
  
      base_frame = _get_base_frame(depth)
      if not base_frame:
          # Frame not found
          raise RuntimeError("Base frame not found")
  
      # Lookup up the frame stack starting at the base frame for the fiber state
      level = 0
      frame = base_frame
      while frame:
          locals = frame.f_locals
          value = locals.get(name)
          if value is not None:
              if level > 0:
                  # Copy a reference of the fiber state in the base frame
                  base_frame.f_locals[name] = value
              return value
          if locals.get(SECTION_BOUNDARY_TAG):
              return None
          frame = frame.f_back
          level += 1
      return None
docs: This function may fiddle with the locals of the calling function,
      to make it the root function of the fiber. If called from a short-lived
      function be sure to use a bigger frame depth.
      Returns the fiber state or None.