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Kishikawa Katsumi 2/17/2020 3:48 AM
guard let URL = URL(string: "\(baseURL)api/v0/tsdb/latest") else { fatalError() } ^ は書けるけど let URL = URL(string: "\(baseURL)api/v0/tsdb/latest")! ^ とは書けなかった。Variable used within its own initial value