os: syscall deprecation or not

[dancerj]

What version of Go are you using (go version)?

$ go version
go version go1.20.3 linux/amd64

Does this issue reproduce with the latest release?

not sure

What operating system and processor architecture are you using (go env)?

go env Output

$ go env
GO111MODULE=""
GOARCH="amd64"
GOBIN=""
GOCACHE="/home/uekawa/.cache/go-build"
GOENV="/home/uekawa/.config/go/env"
GOEXE=""
GOEXPERIMENT=""
GOFLAGS=""
GOHOSTARCH="amd64"
GOHOSTOS="linux"
GOINSECURE=""
GOMODCACHE="/home/uekawa/go/pkg/mod"
GONOPROXY=""
GONOSUMDB=""
GOOS="linux"
GOPATH="/home/uekawa/go"
GOPRIVATE=""
GOPROXY="https://proxy.golang.org,direct"
GOROOT="/usr/lib/go"
GOSUMDB="sum.golang.org"
GOTMPDIR=""
GOTOOLDIR="/usr/lib/go/pkg/tool/linux_amd64"
GOVCS=""
GOVERSION="go1.20.3"
GCCGO="gccgo"
GOAMD64="v1"
AR="ar"
CC="x86_64-pc-linux-gnu-clang"
CXX="x86_64-pc-linux-gnu-clang++"
CGO_ENABLED="1"
GOMOD="/dev/null"
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 -m64 -pthread -fno-caret-diagnostics -Qunused-arguments -Wl,--no-gc-sections -fmessage-length=0 -fdebug-prefix-map=/tmp/go-build3873322193=/tmp/go-build -gno-re

What did you do?

called ProcessState.Sys()

What did you expect to see?

ProcessState.Sys() returns a non-deprecated result.

What did you see instead?

ProcessState.Sys() returns syscall.WaitStatus()

and syscall is marked as deprecated in the documentation
https://cs.opensource.google/go/go/+/master:src/syscall/syscall.go;l=21?q=syscall.go&ss=go%2Fgo

[prattmic]

syscall is deprecated, but changing the return type of os.ProcessState.Sys would be an incompatible change. It is particularly bad in the case of Sys because it returns any, so almost every caller explicitly mentions syscall.WaitStatus.

The alternative would be introducing a new method with a new return type and deprecating Sys, but that is a lot of churn without much concrete value. syscall.WaitStatus works fine, even if it is in a deprecated package.

[ianlancetaylor]

Filed #60797 to undeprecate the syscall package.