Prevent formatter from accidentally compiling #1044

Job	Run time
static analysis (Elixir 1.15.x \| Erlang/OTP 25.x)	28s
mix test windows (Elixir 1.13.x \| Erlang/OTP 22.x)	7m 43s
mix test (Elixir 1.13.x \| Erlang/OTP 22.x)	5m 37s
mix test windows (Elixir 1.13.x \| Erlang/OTP 23.x)	11m 2s
mix test (Elixir 1.13.x \| Erlang/OTP 23.x)	6m 15s
mix test windows (Elixir 1.13.x \| Erlang/OTP 24.x)	2m 18s
mix test (Elixir 1.13.x \| Erlang/OTP 24.x)	4m 31s
mix test windows (Elixir 1.13.x \| Erlang/OTP 25.x)	5m 54s
mix test (Elixir 1.13.x \| Erlang/OTP 25.x)	4m 1s
mix test windows (Elixir 1.14.x \| Erlang/OTP 23.x)	10m 17s
mix test (Elixir 1.14.x \| Erlang/OTP 23.x)	6m 6s
mix test windows (Elixir 1.14.x \| Erlang/OTP 24.x)	6m 36s
mix test (Elixir 1.14.x \| Erlang/OTP 24.x)	4m 47s
mix test windows (Elixir 1.14.x \| Erlang/OTP 25.x)	7m 41s
mix test (Elixir 1.14.x \| Erlang/OTP 25.x)	4m 56s
mix test windows (Elixir 1.15.x \| Erlang/OTP 24.x)	8m 11s
mix test (Elixir 1.15.x \| Erlang/OTP 24.x)	4m 52s
mix test windows (Elixir 1.15.x \| Erlang/OTP 25.x)	6m 42s
mix test (Elixir 1.15.x \| Erlang/OTP 25.x)	4m 47s
	1h 52m 44s

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