exp/slog: add example for custom levels and names

The recommended way to introduce new `Level` (or rename an existing
one) is via `HandlerOptions.ReplaceAttr`. However, this is not
immediately intuitive to package users.

This introduces an example that adds additional log levels and gives
them custom names in a `ReplaceAttr` function. Given the number of users
who will want to introduce custom log levels, this feels like a good
addition to the library documentation.

Change-Id: I175440368fa1d4ce548d9c769ca22fd613151941
Reviewed-on: https://go-review.googlesource.com/c/exp/+/462435
Reviewed-by: Jonathan Amsterdam <jba@google.com>
Run-TryBot: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Alan Donovan <adonovan@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
1 file changed
tree: 9a87d1cebf0b4a4a4f8b3bdeda156412901b134e
  1. apidiff/
  2. cmd/
  3. constraints/
  4. devtools/
  5. ebnf/
  6. ebnflint/
  7. errors/
  8. event/
  9. inotify/
  10. io/
  11. jsonrpc2/
  12. maps/
  13. mmap/
  14. rand/
  15. shiny/
  16. shootout/
  17. slices/
  18. slog/
  19. sumdb/
  20. typeparams/
  21. utf8string/
  22. .gitattributes
  23. .gitignore
  24. codereview.cfg
  26. go.mod
  27. go.sum
  30. README.md



This subrepository holds experimental and deprecated (in the old directory) packages.

The idea for this subrepository originated as the pkg/exp directory of the main repository, but its presence there made it unavailable to users of the binary downloads of the Go installation. The subrepository has therefore been created to make it possible to go get these packages.

Warning: Packages here are experimental and unreliable. Some may one day be promoted to the main repository or other subrepository, or they may be modified arbitrarily or even disappear altogether.

In short, code in this subrepository is not subject to the Go 1 compatibility promise. (No subrepo is, but the promise is even more likely to be violated by go.exp than the others.)

Caveat emptor.