Mixing Swift Initializers
Let’s say you have a type with a failable initializer. Now you want to extend that type to support deserializing from JSON. You throw nice detailed errors if JSON parsing fails and you’d like to throw if anything goes wrong[…] There are two problems here. One is that we can’t delegate to a failable initializer. […] The second is there is no syntax to checking the result of calling the failable initializer even if we could;
selfis only optional in the context of a failable initializer.
