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-h オプションを指定 定義されていない関数があることを通知してくれた

goh@goh% mix run -e 'Issues.CLI.run(["-h"])'
Compiling 1 file (.ex)
warning: variable "count" is unused
  lib/issues/cli.ex:44

warning: function Issues.GithubIssues.fetch/2 is undefined (module Issues.GithubIssues is not available)
  lib/issues/cli.ex:45

usage: issues <user> <project> [count | 4]

userとprojectを指定

goh@goh% mix run -e 'Issues.CLI.run(["elixir-lang", "elixir"])'
** (UndefinedFunctionError) function Issues.GithubIssues.fetch/2 is undefined (module Issues.GithubIssues is not available)
    Issues.GithubIssues.fetch("elixir-lang", "elixir")
    (stdlib) erl_eval.erl:670: :erl_eval.do_apply/6
    (elixir) lib/code.ex:192: Code.eval_string/3
    (elixir) lib/enum.ex:737: Enum."-each/2-lists^foreach/1-0-"/2
    (elixir) lib/enum.ex:737: Enum.each/2
    (mix) lib/mix/tasks/run.ex:132: Mix.Tasks.Run.run/5
    (mix) lib/mix/tasks/run.ex:76: Mix.Tasks.Run.run/1