+ of `go-code`, also for the tests. Check declaration order, owning
+ test filenames, separators after multiline constructs, and errors
+ assigned to `_`. Inspect blank-assigned errors even when `errcheck`
+ reports none: `.golangci.yml` does not enable its `check-blank`
+ setting. Check whole comment paragraphs against the `docs` skill,
+ not only their line width.