Unused module attribute showing incorrect line number

[TBK145]

Environment

• Elixir version (elixir -v):

Erlang/OTP 19 [erts-8.1] [source] [64-bit] [smp:4:4] [async-threads:10] [kernel-poll:false]

IEx 1.4.0-dev (050780c)

• Operating system: Ubuntu 16.04

Current behavior

If I compile a module with unused module attributes I get a warning with a wrong line number:

warning: module attribute @agent_key was set but never used
  lib/queue.ex:1

~$ grep @agent_key * -RIn
lib/queue.ex:67:  @agent_key  :uri

I know you're supposed to define module attributes at the top of your file, but even then, when defining multiple module attributes, you would have the same problem.

Expected behavior

I would expect a warning to be given with lib/queue.ex:67.

[whatyouhide]

Hey @TBK145, thanks for the report. Can you show more code? I have a feeling this is related to useing something 😄

[josevalim]

@whatyouhide it is a bug. I am pushing a fix soon.

[whatyouhide]

Oh, didn't expect that! Good job @josevalim :)