Cryptic "undefined function arg0/0" error message in EEx templates

Hi @axelson! I’m using Elixir 1.10.04:

Erlang/OTP 23 [erts-11.0.3] [source] [64-bit] [smp:2:2] [ds:2:2:10] [async-threads:1] [hipe]

Elixir 1.10.4 (compiled with Erlang/OTP 22)

Haven’t tested with a different version tbh.