为什么在运行mix coveralls时会出现编译错误

Question

当我尝试运行任务组合套装时，我得到了这个错误。

** (exit) an exception was raised:
    ** (MatchError) no match of right hand side value: :error
        cover.erl:1580: :cover.do_compile_beam2/5
        cover.erl:1480: :cover.do_compile_beam/3
        (stdlib) lists.erl:1239: :lists.map/2
        cover.erl:2795: anonymous fn/2 in :cover.pmap_spawn/4
    cover.erl:585: :cover.call/1
    lib/excoveralls/cover.ex:12: ExCoveralls.Cover.compile/1
    lib/excoveralls.ex:32: ExCoveralls.start/2
    (mix) lib/mix/tasks/test.ex:351: Mix.Tasks.Test.run/1
    (mix) lib/mix/task.ex:331: Mix.Task.run_task/3
    (mix) lib/mix/task.ex:365: Mix.Task.run_alias/3
    (mix) lib/mix/task.ex:292: Mix.Task.run/2
    lib/mix/tasks.ex:54: Mix.Tasks.Coveralls.do_run/2

10:03:50.512 [error] Process #PID<0.4329.0> raised an exception
** (MatchError) no match of right hand side value: :error
    cover.erl:1580: :cover.do_compile_beam2/5
    cover.erl:1480: :cover.do_compile_beam/3
    (stdlib) lists.erl:1239: :lists.map/2
    cover.erl:2795: anonymous fn/2 in :cover.pmap_spawn/4

我的3+应用程序对套装使用了相同的设置，并且在所有这些应用程序中都可以正常工作。其中唯一的区别是我没有HTML，因为它只是rest api，但即使我尝试删除coveralls html任务，它也不起作用。这似乎与在erlang :cover中编译有关，但我尝试进行调试，它指向正确的目录。

这是我的Mix文件：

defmodule Tow.MixProject do
  use Mix.Project

  def project do
    [
      app: :tow,
      version: "0.1.0",
      elixir: "~> 1.8",
      compilers: [:phoenix] ++ Mix.compilers(),
      start_permanent: Mix.env() == :prod,
      test_coverage: [tool: ExCoveralls],
      preferred_cli_env: [
        coveralls: :test,
        "coveralls.detail": :test,
        "coveralls.post": :test,
        "coveralls.html": :test
      ],
      elixirc_paths: elixirc_paths(Mix.env()),
      deps: deps(),
      aliases: aliases()
    ]
  end

  # Run "mix help compile.app" to learn about applications.
  def application do
    [
      extra_applications: [:logger, :plug_cowboy],
      mod: {Tow.Application, []}
    ]
  end

  defp elixirc_paths(:test), do: ["lib", "test/support"]
  defp elixirc_paths(_), do: ["lib"]

  defp deps do
    [
      {:phoenix, "~> 1.4"},
      {:flow, "~> 0.14"},
      {:timex, "~> 3.1"},
      {:math, "~> 0.3.0"},
      {:plug_cowboy, "~> 2.0"},
      {:poison, "~> 3.1"},
      {:ecto_sql, "~> 3.0"},
      {:mariaex, "~> 0.8"},
      {:statistics, "~> 0.5.0"},
      {:elixir_uuid, "~> 1.2"},
      {:ex_aws, "~> 2.1"},
      {:ex_aws_s3, "~> 2.0"},
      {:config_tuples, "~> 0.2.0"},
      # dev / test
      {:benchee, "~> 1.0", only: :dev},
      {:phoenix_live_reload, "~> 1.0", only: :dev},
      {:ex_machina, "~> 2.2.2", only: :test},
      {:faker, "~> 0.10", only: :test},
      {:excoveralls, "~> 0.10", only: :test}
    ]
  end

  # Aliases are shortcuts or tasks specific to the current project.
  # For example, to create, migrate and run the seeds file at once:
  #
  #     $ mix ecto.setup
  #
  # See the documentation for `Mix` for more info on aliases.
  defp aliases do
    [
      "ecto.setup": ["ecto.create", "ecto.load", "ecto.migrate"],
      "ecto.reset": ["ecto.drop", "ecto.setup"],
      test: ["ecto.create --quiet", "ecto.migrate", "test"]
    ]
  end
end

Answer 1

问题出在erlang封面库上，我的一个模块中有一个TypeSpec，由于某种原因无法编译。