@NotNull
    public String getFirstFile() {
        Type bt = type;
        if (bt instanceof ModuleType) {

            String file = ((ModuleType) bt).file;
            return file != null ? file : "<built-in module>";
        }

        String file = this.file;
        if (file != null) {
            return file;
        }

        return "<built-in binding>";
    }