code: def check_runtime_errors(cmd_derived_from_alias, pos_args_table):
      
      for placeholder, value in pos_args_table.items():
          exec('{} = "{}"'.format(placeholder, value))  # pylint: disable=exec-used
  
      expressions = get_placeholders(cmd_derived_from_alias)
      for expression in expressions:
          try:
              exec(expression)  # pylint: disable=exec-used
          except Exception as exception:  # pylint: disable=broad-except
              error_msg = PLACEHOLDER_EVAL_ERROR.format(expression, exception)
              raise CLIError(error_msg)
docs: Validate placeholders and their expressions in cmd_derived_from_alias to make sure
      that there is no runtime error (such as index out of range).
  
      Args:
          cmd_derived_from_alias: The command derived from the alias
              (include any positional argument placehodlers)
          pos_args_table: The positional argument table.