The `go vet` subcommand now includes the
[stdversion](https://beta.pkg.go.dev/golang.org/x/tools/go/analysis/passes/stdversion)
analyzer, which flags references to symbols that are too new for the version
of Go in effect in the referring file. (The effective version is determined
by the `go` directive in the file's enclosing `go.mod` file, and
by any [`//go:build` constraints](https://pkg.go.dev/cmd/go#hdr-Build_constraints)
in the file.)

pkg syscall (freebsd-386-cgo), const IPV6_TCLASS ideal-int
pkg syscall (freebsd-386-cgo), const IPV6_USE_MIN_MTU ideal-int
pkg syscall (freebsd-386-cgo), const IPV6_VERSION ideal-int
pkg syscall (freebsd-386-cgo), const IPV6_VERSION_MASK ideal-int
pkg syscall (freebsd-386-cgo), const IP_ADD_SOURCE_MEMBERSHIP ideal-int
pkg syscall (freebsd-386-cgo), const IP_BINDANY ideal-int

pkg testing, method (*B) Run(string, func(*B)) bool
pkg testing, method (*T) Run(string, func(*T)) bool
pkg testing, type InternalExample struct, Unordered bool
pkg unicode, const Version = "9.0.0"
pkg unicode, var Adlam *RangeTable
pkg unicode, var Bhaiksuki *RangeTable
pkg unicode, var Marchen *RangeTable
pkg unicode, var Newa *RangeTable
pkg unicode, var Osage *RangeTable

pkg syscall (freebsd-riscv64), type SysProcAttr struct, Jail int #46259
pkg testing, func Testing() bool #52600
pkg testing/slogtest, func TestHandler(slog.Handler, func() []map[string]interface{}) error #56345
pkg unicode, const Version = "15.0.0" #55079
pkg unicode, var Cypro_Minoan *RangeTable #55079
pkg unicode, var Kawi *RangeTable #55079
pkg unicode, var Nag_Mundari *RangeTable #55079
pkg unicode, var Old_Uyghur *RangeTable #55079