Dialyzer unformatted error

[OvermindDL1]

While building a plt dialyzer itself threw an error:

** (throw) {:dialyzer_error, [67, 111, 117, 108, 100, 32, 110, 111, 116, 32, 103, 101, 116, 32, 97, 98, 115, 116, 114, 97, 99, 116, 32, 99, 111, 100, 101, 32, 102, 111, 114, 32, 102, 105, 108, 101, 58, 32, 'c:/Users/<user>/Projects/<project>/_build/dev/lib/relx/ebin/relx.beam', 32, 40, 112, 108, 101, 97, 115, 101, 32, 114, ...]}
    dialyzer_plt.erl:469: :dialyzer_plt.compute_md5_from_file/1
    dialyzer_plt.erl:436: :dialyzer_plt.compute_new_md5_1/3
    dialyzer_plt.erl:406: :dialyzer_plt.check_plt/3
    dialyzer_cl.erl:254: :dialyzer_cl.check_plt/3
    dialyzer_cl.erl:187: :dialyzer_cl.plt_common/3
    dialyzer.erl:167: :dialyzer.run/1
    lib/dialyxir/plt.ex:166: Dialyxir.Plt.plt_add/2
    lib/dialyxir/plt.ex:41: Dialyxir.Plt.check_plt/4
    (elixir) lib/enum.ex:1755: Enum."-reduce/3-lists^foldl/2-0-"/3
    lib/dialyxir/plt.ex:28: Dialyxir.Plt.check_plts/1
    lib/mix/tasks/dialyzer.ex:128: Mix.Tasks.Dialyzer.check_plt/0
    lib/mix/tasks/dialyzer.ex:110: Mix.Tasks.Dialyzer.run/1
    (mix) lib/mix/task.ex:294: Mix.Task.run_task/3
    (mix) lib/mix/cli.ex:58: Mix.CLI.run_task/2
    (elixir) lib/code.ex:370: Code.require_file/2

That error should probably be caught and pretty-printed (or at least iolist-to-binary'd) so we know what happened. :-)

[taiansu]

I encountered the same error with Elixir 1.4.1 & Erlang/OTP 19 on macOS.

** (throw) {:dialyzer_error, [67, 111, 117, 108, 100, 32, 110, 111, 116, 32, 103, 101, 116, 32, 97, 98, 115, 116, 114, 97, 99, 116, 32, 99, 111, 100, 101, 32, 102, 111, 114, 32, 102, 105, 108, 101, 58, 32, '/Users/tai/Projects/cogini/HOBS-website/source/_build/dev/lib/relx/ebin/relx.beam', 32, 40, 112, 108, 101, 97, 115, 101, 32, 114, ...]}
    dialyzer_plt.erl:469: :dialyzer_plt.compute_md5_from_file/1
    dialyzer_plt.erl:436: :dialyzer_plt.compute_new_md5_1/3
    dialyzer_plt.erl:406: :dialyzer_plt.check_plt/3
    dialyzer_cl.erl:254: :dialyzer_cl.check_plt/3
    dialyzer_cl.erl:187: :dialyzer_cl.plt_common/3
    dialyzer.erl:167: :dialyzer.run/1
    lib/dialyxir/plt.ex:166: Dialyxir.Plt.plt_add/2
    lib/dialyxir/plt.ex:41: Dialyxir.Plt.check_plt/4
    (elixir) lib/enum.ex:1755: Enum."-reduce/3-lists^foldl/2-0-"/3
    lib/dialyxir/plt.ex:28: Dialyxir.Plt.check_plts/1
    lib/mix/tasks/dialyzer.ex:128: Mix.Tasks.Dialyzer.check_plt/0
    lib/mix/tasks/dialyzer.ex:110: Mix.Tasks.Dialyzer.run/1
    (mix) lib/mix/task.ex:294: Mix.Task.run_task/3
    (mix) lib/mix/cli.ex:58: Mix.CLI.run_task/2
    (elixir) lib/code.ex:370: Code.require_file/2

The first char list in the error message is 'Could not get abstract code for file: ' when manually print it out.

[jeremyjh]

0.4.4 handles this better; it will now print out the error string and highlight it. The problem here though is probably in relx; it looks like it may not include debug_info in its default configuration, only in its dialyzer profile. I'm afraid I don't know how to specify that as a build option in mix.exs, seems like it should be possible.