Ruby脳にはCrystalつらいのカレンダー | Advent Calendar 2015 - Qiita

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[tmtms]

こっそり独りアドベントカレンダーやってます

[tbpg]

異彩を放っている

[koyancya]

流石、一冊の Software Design に２本も記事を書いた人だ

[stealthinu]

とみたさんのひとりAdvent Calendar！Crystalについてのつらみアドベントカレンダーらしい。