Unable to compile the elixir project

Questions / Help
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1

Getting this error when running mix deps.compile.
I tried rm -rf deps _build mix.lock, reinstalling elixir via asdf. I am running out of ideas now. Any help is appreciated.

===> Compiling src/rabbit_heartbeat.erl failed
src/rabbit_heartbeat.erl:22:39: syntax error before: ‘maybe’

rabbit_heartbeat.erl:20:2: type heartbeaters() undefined
rabbit_heartbeat.erl:32:13: type heartbeaters() undefined
rabbit_heartbeat.erl:38:13: type heartbeaters() undefined
rabbit_heartbeat.erl:49:21: type heartbeaters() undefined
rabbit_heartbeat.erl:50:22: type heartbeaters() undefined

** (Mix) Could not compile dependency :rabbit_common, “/Users/ranbirs/.asdf/installs/elixir/1.17.3-otp-26/.mix/elixir/1-17/rebar3 bare compile --paths /Users/ranbirs/workspace/carts-api-bk2/carts-api/_build/dev/lib/*/ebin” command failed. Errors may have been logged above. You can recompile this dependency with “mix deps.compile rabbit_common --force”, update it with “mix deps.update rabbit_common” or clean it with “mix deps.clean rabbit_common”

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2

Have you tried mix deps.update rabbit_common and then attempting to compile again?

3

yes, same error persists.
I even tried git cloning into a new folder and installed deps from scratch but no luck.

4

maybe in Erlang is enabled by default only since OTP 27, earlier you need to use some flag to enable it, but I am not sure how you can do it in Mix for dependencies.

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5

In addition to the above, here’s more info on maybe Expressions — Erlang System Documentation v27.2

6

Hello @rsshek, welcome to the forums :slight_smile:

Can you upgrade to OTP 27? The maybe keyword will be supported out of the box.

Otherwise, can you try with this environment ERL_FLAGS='-enable-feature maybe_expr'?

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7

I was running this app on erlang erlang 26.2.5.5 just tomorrow and before and it was working fine. But I will explore more to see if this what can I do here

8

I missed the Erlang version bit (serves me right for reading through the phone on the bed). Just upgrade to Erlang 27 and try it.

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9

tried with OTP 27 as well (elixir 1.18.1-otp-27)
getting same error again.

** (Mix) Could not compile dependency :rabbit_common, "/Users/ranbirs/.asdf/installs/elixir/1.18.1-otp-27/.mix/elixir/1-18/rebar3 bare compile --paths /Users/ranbirs/workspace/carts-api-bk2/carts-api/_build/dev/lib/*/ebin" command failed.Preformatted text

10

Hum strange :thinking:

I have had the same error before but generally I clean everything and it works. Have you tried with the ERL_FLAGS variable?

11

yes tried. same error

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12

Have you tried deleting both directories – _build and deps – after upgrading Erlang?

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13

yes, tried reinstalling deps after upgrading to erlang 27.2. No luck :frowning:

14

Currently the erlang AMQP client (and subsequent dependencies) don’t support OTP-27, the only option is to downgrade to OTP-26.

Here is the official link: Erlang Version Requirements | RabbitMQ

PS: I think there was somewhere a more detailed explanation on what it specifically breaks, but I cannot find it now.

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