What is your Elixir version on Heroku? It is likely that Phoenix is using more recent features of Elixir (to be more precise, of Elixir v1.5.1+) and you are on an earlier version.
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What is your Elixir version on Heroku? It is likely that Phoenix is using more recent features of Elixir (to be more precise, of Elixir v1.5.1+) and you are on an earlier version.
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