安装出错 BenSampo/Laravel-enum

    1/2:    https://mirrors.aliyun.com/composer/p/provider-2019-07$c93001db64fb24f1049c13276dbf580dd46299804e55c6cb00ca4849ba0112d9.json
    2/2:    https://mirrors.aliyun.com/composer/p/provider-latest$2649f0e1dcf1ae06ff55c02a2264b0ed7fbb60fbb4fd8233b800a292e413f797.json
    Finished: success: 2, skipped: 0, failure: 0, total: 2
Enter passphrase for key '/Users/wangqinfeng/.ssh/id_rsa':
Using version ^1.21 for bensampo/laravel-enum
./composer.json has been updated
Loading composer repositories with package information
Enter passphrase for key '/Users/wangqinfeng/.ssh/id_rsa':
Updating dependencies (including require-dev)
Your requirements could not be resolved to an installable set of packages.

  Problem 1
    - Conclusion: don't install hanneskod/classtools 1.2.0
    - Conclusion: don't install bensampo/laravel-enum v1.21.3
    - Conclusion: don't install bensampo/laravel-enum v1.21.2
    - Conclusion: don't install bensampo/laravel-enum v1.21.1
    - Conclusion: remove nikic/php-parser v4.2.2
    - Installation request for symfony/finder (locked at v3.4.30) -> satisfiable by symfony/finder[v3.4.30].
    - Installation request for bensampo/laravel-enum ^1.21 -> satisfiable by bensampo/laravel-enum[v1.21, v1.21.1, v1.21.2, v1.21.3].
    - Conclusion: don't install nikic/php-parser v4.2.2
    - bensampo/laravel-enum v1.21 requires hanneskod/classtools ~1.0 -> satisfiable by hanneskod/classtools[1.0.0, 1.0.1, 1.1.0, 1.1.1, 1.1.2, 1.1.3, 1.2.0].
    - hanneskod/classtools 1.0.1 requires nikic/php-parser ~2.0 -> satisfiable by nikic/php-parser[v2.0.0, v2.0.1, v2.1.0, v2.1.1].
    - hanneskod/classtools 1.1.0 requires nikic/php-parser ~2.0 -> satisfiable by nikic/php-parser[v2.0.0, v2.0.1, v2.1.0, v2.1.1].
    - hanneskod/classtools 1.1.1 requires nikic/php-parser ~2.0 -> satisfiable by nikic/php-parser[v2.0.0, v2.0.1, v2.1.0, v2.1.1].
    - hanneskod/classtools 1.1.2 requires nikic/php-parser ^3.0 -> satisfiable by nikic/php-parser[v3.0.0, v3.0.1, v3.0.2, v3.0.3, v3.0.4, v3.0.5, v3.0.6, v3.1.0, v3.1.1, v3.1.2, v3.1.3, v3.1.4, v3.1.5].
    - hanneskod/classtools 1.1.3 requires nikic/php-parser ^3 -> satisfiable by nikic/php-parser[v3.0.0, v3.0.1, v3.0.2, v3.0.3, v3.0.4, v3.0.5, v3.0.6, v3.1.0, v3.1.1, v3.1.2, v3.1.3, v3.1.4, v3.1.5].
    - hanneskod/classtools 1.0.0 requires nikic/php-parser ~1.0 -> satisfiable by nikic/php-parser[v1.0.0, v1.0.1, v1.0.2, v1.1.0, v1.2.0, v1.2.1, v1.2.2, v1.3.0, v1.4.0, v1.4.1].
    - Can only install one of: nikic/php-parser[v1.2.1, v4.2.2].
    - Can only install one of: nikic/php-parser[v1.2.2, v4.2.2].
    - Can only install one of: nikic/php-parser[v1.3.0, v4.2.2].
    - Can only install one of: nikic/php-parser[v1.4.0, v4.2.2].
    - Can only install one of: nikic/php-parser[v1.4.1, v4.2.2].
    - Can only install one of: nikic/php-parser[v2.0.0, v4.2.2].
    - Can only install one of: nikic/php-parser[v2.0.1, v4.2.2].
    - Can only install one of: nikic/php-parser[v2.1.0, v4.2.2].
    - Can only install one of: nikic/php-parser[v2.1.1, v4.2.2].
    - Can only install one of: nikic/php-parser[v3.0.0, v4.2.2].
    - Can only install one of: nikic/php-parser[v3.0.1, v4.2.2].
    - Can only install one of: nikic/php-parser[v3.0.2, v4.2.2].
    - Can only install one of: nikic/php-parser[v3.0.3, v4.2.2].
    - Can only install one of: nikic/php-parser[v3.0.4, v4.2.2].
    - Can only install one of: nikic/php-parser[v3.0.5, v4.2.2].
    - Can only install one of: nikic/php-parser[v3.0.6, v4.2.2].
    - Can only install one of: nikic/php-parser[v3.1.0, v4.2.2].
    - Can only install one of: nikic/php-parser[v3.1.1, v4.2.2].
    - Can only install one of: nikic/php-parser[v3.1.2, v4.2.2].
    - Can only install one of: nikic/php-parser[v3.1.3, v4.2.2].
    - Can only install one of: nikic/php-parser[v3.1.4, v4.2.2].
    - Can only install one of: nikic/php-parser[v3.1.5, v4.2.2].
    - Can only install one of: nikic/php-parser[v1.0.0, v4.2.2].
    - Can only install one of: nikic/php-parser[v1.0.1, v4.2.2].
    - Can only install one of: nikic/php-parser[v1.0.2, v4.2.2].
    - Can only install one of: nikic/php-parser[v1.1.0, v4.2.2].
    - Can only install one of: nikic/php-parser[v1.2.0, v4.2.2].
    - Installation request for nikic/php-parser (locked at v4.2.2) -> satisfiable by nikic/php-parser[v4.2.2].

Installation failed, reverting ./composer.json to its original content.

laravel 5.5