Thats a good outlook. Dont worry about any problem, just import something an its fixed! More imports the better! Hopefully we can do away with all code, and just import everything.
Go 1.13 has incorporated most of what this package does into the standard library. It really doesn't matter much whether the code is in a de-facto standard package or folded into the standard library IMHO, but Rust could do the same.
We're talking about error boilerplate here.
Just as I do not write assembly by hand, but instead let the compiler generate that, just as I don't write http clients by hand, but let someone else do that, yes I would also rather not write error boilerplate by hand.
I would love it if I didn't have to write as much code to solve problems, but I recognize that the problems I'm solving are mostly specific enough that they require bespoke code specialized to the problem space.
However, error handling? Yeah, I don't care to hand-write that.
Said less glibly, I will happily import stuff when it makes my life easier, and write it myself when that is better.
You're absolutely right about implementing the `Error` trait yourself in Rust, it's a pain! And with many things, the Rust team felt it was better to leave error experimentation to an external library, as the community can iterate more quickly and settle on a favorite. At the moment, that favorite is `thiserror` (for defining errors in a library) and `anyhow` (for working with errors in application code)
That's been a pretty common pattern in Rust - leave some less clear parts of the standard library out for external crates to implement and experiment on. So you'll see almost all big Rust projects use one of those error handling libraries. You _could_ implement it with just the standard library, but you're just giving yourself more work for little to no gain.
Here's an example without using external libraries:
https://play.rust-lang.org/?version=stable&mode=debug&editio...
Not particularly good or bad (and I didn't even replicate all the functionality that `thiserror` gives you).
So yeah, Go and Rust have different philosophies for their standard library, and you can argue about which is better, but I don't think one can be proved objectively better than the other.