Which is a great idea: knowing which expressions can fail and which ones cannot. However, the way go encodes this idea isn't very ergonomic or elegant. I'd sugg

Which is a great idea: knowing which expressions can fail and which ones cannot. However, the way go encodes this idea isn't very ergonomic or elegant. I'd suggest that you take a look at ways other languages do this. For example, the `Either` type in Haskell or the disjunction type `scalaz.\/` in Scala.