f, err := os.CreateTemp(tmpdir, filepat)
	if err != nil {
		return nil, err
	}
	gofilename := f.Name()
	f.Close()
	defer os.Remove(gofilename)

	if err := os.WriteFile(gofilename, []byte(mangleCheckCode), 0644); err != nil {
		return nil, err
	}

	command := exec.Command(cmd, "-S", "-o", "-", gofilename)
	buf, err := command.Output()
	if err != nil {
		return nil, err
	}

			lastFunction = funcIdx // avoid printing same function twice
		}

		if o.negative {
			fmt.Fprintf(&errbuf, "%s:%d: %s: wrong opcode found: %q\n", t.goFileName(), o.line, env, o.opcode.String())
		} else {
			fmt.Fprintf(&errbuf, "%s:%d: %s: opcode not found: %q\n", t.goFileName(), o.line, env, o.opcode.String())
		}
	}
	return errors.New(errbuf.String())
}