This is where languages diverge. Many languages use exceptions to throw the error until someone explicitly catches it and you have a stack trace of sorts. This might tell you where the error was thrown but doesn't provide a lot of helpful insight all of the time. In Go, I like how I can have some options that I always must choose from when writing code:
1. Ignore the error and proceed onward (`foo, _ := doSomething()`)
2. Handle the error by ending early, but provide no meaningful information (`return nil, err`)
3. Handle the error by returning early with helpful context (return a general wrapped error)
4. Handle the error by interpreting the error we received and branching differently on it. Perhaps our database couldn't find a row to alter, so our service layer must return a not found error which gets reflected in our API as a 404. Perhaps our idempotent deletion function encountered a not found error, and interprets that as a success.
In Go 2, or another language, I think the only changes I'd like to see are a `Result<Value, Failure>` type as opposed to nillable tuples (a la Rust/Swift), along with better-typed and enumerated error types as opposed to always using `error` directly to help with error type discoverability and enumeration.
This would fit well for Go 2 (or a new language) because adding Result types on top of Go 1's entrenched idiomatic tuple returns adds multiple ways to do the same thing, which creates confusion and division on Go 1 code.