An interpreter handling over effects for Eff Yoshimura Hikaru(吉村 優) hikaru_yoshimura@r.recruit.co.jp Recruit Marketing Partners Co., Ltd. October 17, 2020 @ ScalaMatsuri 2020 https://github.com/y-yu/scalamatsuri2020 (e6fc40b) Yoshimura Hikaru (hikaru_yoshimura@r.recruit.co.jp) An interpreter handling over effects for Eff October 17, 2020 @ ScalaMatsuri 2020 1 / 45 Table of contents 1 Who am I? 2 I