error running mix task

[sescobb27]

iex version:

$ iex
Erlang/OTP 24 [erts-12.1] [source] [64-bit] [smp:12:12] [ds:12:12:10] [async-threads:1] [jit]
Interactive Elixir (1.12.3) - press Ctrl+C to exit (type h() ENTER for help)

once i ran the command it failed

$ mix compile.unused
** (MatchError) no match of right hand side value: {:error, {:already_started, #PID<0.281.0>}}
    lib/mix/tasks/compile.unused.ex:90: Mix.Tasks.Compile.Unused.run/1
    (mix 1.12.3) lib/mix/task.ex:394: anonymous fn/3 in Mix.Task.run_task/3
    (mix 1.12.3) lib/mix/project.ex:353: Mix.Project.in_project/4
    (elixir 1.12.3) lib/file.ex:1560: File.cd!/2
    (mix 1.12.3) lib/mix/task.ex:520: anonymous fn/4 in Mix.Task.recur/1
    (elixir 1.12.3) lib/enum.ex:2385: Enum."-reduce/3-lists^foldl/2-0-"/3
    (mix 1.12.3) lib/mix/task.ex:519: Mix.Task.recur/1
    (mix 1.12.3) lib/mix/project_stack.ex:181: Mix.ProjectStack.recur/1

using

{:mix_unused, "~> 0.2.0"}

[hauleth]

mix compile.unused should not be ran individually, however thanks for the report, I will check out what is the cause and how I can prevent it from happening.

[sescobb27]

🙈 sorry for the miss usage, i saw it was a mix task and run it alone. thanks for checking up tho

[hauleth]

It was separate taks in pre-release versions when it was designed for Elixir 1.9 or earlier. Now it is compiler as it provides more features like ElixirLS integration or providing immediate feedback to the user. However this should not cause the problem you are describing there so I keep the issue open and try to find a way to make the message more human friendly.

[hauleth]

It should be resolved now.