Like the article mentions, they didn't bring over stack traces (namely the `Formatter` interface) from xerrors. I wrote a library[1] around it that would generate true stack traces. I don't use it as much as I used to, because I don't want to depend on a package like xerrors I don't trust to remain maintained, but it was a fun exercise at the time, and very useful while I used it. I wish that we wouldn't have to depend on a tool like Sentry for bringing this about, like the author suggests.