runtime/debug: BuildSetting does not document DefaultGODEBUG

[rittneje]

Go version

go version go1.21.7 darwin/amd64

Output of go env in your module/workspace:

GO111MODULE='auto'
GOARCH='amd64'
GOBIN=''
GOCACHE='/tmp/.gocache'
GOENV='/Users/rittneje/Library/Application Support/go/env'
GOEXE=''
GOEXPERIMENT=''
GOFLAGS=''
GOHOSTARCH='amd64'
GOHOSTOS='darwin'
GOINSECURE=''
GOMODCACHE='/Users/rittneje/go/pkg/mod'
GONOPROXY='<redacted>'
GONOSUMDB='<redacted>'
GOOS='darwin'
GOPATH='/Users/rittneje/go'
GOPRIVATE='<redacted>'
GOPROXY='https://proxy.golang.org,direct'
GOROOT='/Users/rittneje/go1.21.7'
GOSUMDB='sum.golang.org'
GOTMPDIR=''
GOTOOLCHAIN='local'
GOTOOLDIR='/Users/rittneje/go1.21.7/pkg/tool/darwin_amd64'
GOVCS='public:git<redacted>:git,private:off'
GOVERSION='go1.21.7'
GCCGO='gccgo'
GOAMD64='v1'
AR='ar'
CC='clang'
CXX='clang++'
CGO_ENABLED='1'
GOMOD=''
GOWORK=''
CGO_CFLAGS='-O2 -g'
CGO_CPPFLAGS=''
CGO_CXXFLAGS='-O2 -g'
CGO_FFLAGS='-O2 -g'
CGO_LDFLAGS='-O2 -g'
PKG_CONFIG='pkg-config'
GOGCCFLAGS='-fPIC -arch x86_64 -m64 -pthread -fno-caret-diagnostics -Qunused-arguments -fmessage-length=0 -ffile-prefix-map=/var/folders/kf/kr7_s3xx0l12zbj3jrn082hmzy5gvy/T/go-build1761758225=/tmp/go-build -gno-record-gcc-switches -fno-common'

What did you do?

Read the docs for runtime/debug.BuildSetting.

What did you see happen?

No mention of DefaultGODEBUG setting.

What did you expect to see?

I expected DefaultGODEBUG to be mentioned. It was spec'd as part of #56986 and was in fact implemented.

https://go.dev/play/p/ahX1MXkVAu_G

[gopherbot]

Change https://go.dev/cl/597979 mentions this issue: runtime/debug: document DefaultGODEBUG as a BuildSetting

[prattmic]

@gopherbot Please backport to 1.23 and 1.24. This is a documentation fix that makes working with compatibility GODEBUGs more clear.

[gopherbot]

Backport issue(s) opened: #73677 (for 1.23), #73678 (for 1.24).

Remember to create the cherry-pick CL(s) as soon as the patch is submitted to master, according to https://go.dev/wiki/MinorReleases.