google-api-go-client: OAuth & Getting Started instructions do not work

TL;DR: The version of golang.org/x/oauth2 you get from go get does not work with any of the stated documentation.

1. README.md refers to issuing go get google.golang.org/api/storage/v1 and gives an example of Application Default Credentials. These examples and their docs simply do not work because the version of golang/x/oauth2 etc. that you get with go get do not contain support for Application Default Credentials’ methods.

1. GettingStarted.md’s OAuth HTTP Client instructions points to example code that don’t do any credential handling, but instead refer to a unnamed registerDemo that is not findable using GitHub search. Grepping finally finds it in examples/main.go. Perhaps the link should go to main.go instead?
2. GettingStarted.md’s OAuth HTTP Client instructions points to an OAuth config that won’t work, even if you do figure out you need to call oauth2.Config.AuthCodeUrl because no RedirectURL was provided, and unless you’re going to erect a whole new server like examples/main.go does, you need to choose a redirect URI, and the simplest form for a standalone command-line binary is urn:ietf:wg:oauth:2.0:oob. Finding how to do this was not straightforward.
3. GettingStarted.md’s OAuth HTTP Client instructions refer to a newOAuthClient function that is not of a package, but then doesn’t tell you what package it’s in and has no link. (And actually, it’s not in any package, but is a part of examples/main.go, which you cannot include.)

Finally, GoDoc for golang.org/x/oauth2, golang.org/x/oauth2/google, and even google.golang.api/storage/v1 all refer to newer code than what go get fetches, so it leads you down the primrose path. Is there a GoDoc docset frozen to what go get fetches? (e.g., with a version identifier.)