code: def pop_with_body_instrs(setup_with_instr, queue):
      
      body_instrs = popwhile(op.is_not(setup_with_instr.arg), queue, side='left')
  
      # Last two instructions should always be POP_BLOCK, LOAD_CONST(None).
      # These don't correspond to anything in the AST, so remove them here.
      load_none = body_instrs.pop()
      expect(load_none, instrs.LOAD_CONST, "at end of with-block")
      pop_block = body_instrs.pop()
      expect(pop_block, instrs.POP_BLOCK, "at end of with-block")
      if load_none.arg is not None:
          raise DecompilationError(
              "Expected LOAD_CONST(None), but got "
              "%r instead" % (load_none)
          )
  
      # Target of the setup_with should be a WITH_CLEANUP instruction followed by
      # an END_FINALLY.  Neither of these correspond to anything in the AST.
      with_cleanup = queue.popleft()
      expect(with_cleanup, instrs.WITH_CLEANUP, "at end of with-block")
      end_finally = queue.popleft()
      expect(end_finally, instrs.END_FINALLY, "at end of with-block")
  
      return body_instrs
docs: Pop instructions from `queue` that form the body of a with block.