Elixir 1.17 compiler warning: Req is not defined

[jaimeiniesta]

Elixir 1.17 raises a compiler warning that Req is not defined. We don't use Req in our project, and it's an optional dependency, so it should be silenced in this case.

Environment

• Elixir & Erlang versions (elixir --version):

Erlang/OTP 27 [erts-15.1.2] [source] [64-bit] [smp:8:8] [ds:8:8:10] [async-threads:1] [jit]

Elixir 1.17.3 (compiled with Erlang/OTP 27)

• ExAws version mix deps |grep ex_aws

* ex_aws (Hex package) (mix)
  locked at 2.5.7 (ex_aws) 2c3c5775

* ex_aws_s3 (Hex package) (mix)
  locked at 2.5.5 (ex_aws_s3) ac34af1e

• HTTP client version. IE for hackney do mix deps | grep hackney

* httpoison (Hex package) (mix)
  locked at 2.2.1 (httpoison) 51364e6d

* hackney (Hex package) (rebar3)
  locked at 1.20.1 (hackney) fe9094e5

Current behavior

We get this compiler warning:

==> ex_aws
Compiling 28 files (.ex)
    warning: Req.request/1 is undefined (module Req is not available or is yet to be defined)
    │
 24 │     |> Req.request()
    │            ~
    │
    └─ lib/ex_aws/request/req.ex:24:12: ExAws.Request.Req.request/5

Expected behavior

Not to get this compiler warning when we're not using Req, as it's an optional dependency.