Elixir 18try Catch Rescue

参考：https://elixir-lang.org/getting-started/try-catch-and-rescue.html

跟Ruby确实很像（现在终于开始像）

#raise "hi"
#
try do
  raise "lalala"
rescue
  e in RuntimeError -> e
  IO.puts e
end

# 通常不用try  rescue/catch, 在代码中做处理。
case File.read "hello" do
...>   {:ok, body}      -> IO.puts "Success: #{body}"
...>   {:error, reason} -> IO.puts "Error: #{reason}"
...> end

# 使用exit 来退出当前Process
iex(1)> spawn_link fn -> exit(3) end
** (EXIT from #PID<0.103.0>) shell process exited with reason: 3

Interactive Elixir (1.8.1) - press Ctrl+C to exit (type h() ENTER for help)