Livebookでprotocolを扱いたい場合

現象

Livebookでモジュールにprotocolを実装する場合、そのままでは以下警告が出て上手く動作しないことがある。

warning: the XXXX protocol has already been consolidated, an implementation for Unzip.S3File has no effect.
If you want to implement protocols after compilation or during tests, check the "Consolidation" section in the Protocol module documentation

対策

Mix.installにconsolidate_protocols: falseを追加する

Mix.install(
  [
    deps
  ],
  consolidate_protocols: false
)

参考

Although doing so is not recommended as it may affect the performance of your code.