if id != "" {
		return id
	}

	path := base.Tool(name)
	desc := "go tool " + name

	// Special case: undocumented -vettool overrides usual vet,
	// for testing vet or supplying an alternative analysis tool.
	if name == "vet" && VetTool != "" {
		path = VetTool
		desc = VetTool
	}

	cmdline := str.StringList(cfg.BuildToolexec, path, "-V=full")
	cmd := exec.Command(cmdline[0], cmdline[1:]...)