In the previous chapters, we learned about a few ways to handle functions that have to deal with different kinds of errors. So far, we have:

• Simply panicked when encountering them
• Returned only one kind of error and converted all others into it
• Returned different kinds of errors in a Box

Most of these have been used because we didn't reach this recipe yet. Now, we are going to learn about the preferred way of doing things, creating a custom kind of Error that contains multiple sub-errors.