This is necessary to avoid compiler and linker conflicts. Adding
a "vendor/" prefix also maintains the invariant that standard
library packages begin with a dotless path element.

The module requirements of std and cmd do not influence version
selection in other modules. They are only considered when running
module commands like 'go get' and 'go mod vendor' from a directory
in GOROOT/src.

Maintaining vendor directories

## For developers

Release notes should be added to `next` by editing existing files or creating
new files. **Do not add RELNOTE=yes comments in CLs.** Instead, add a file to
the CL (or ask the author to do so).

At the end of the development cycle, the files will be merged by being
concatenated in sorted order by pathname. Files in the directory matching the

  (the latter if this is not a complete fix) to this comment
+ If referring to a repo other than `golang/go` you can use the
  `owner/repo#issue_number` syntax: `Fixes golang/tools#1234`
+ We do not use Signed-off-by lines in Go. Please don't add them.
  Our Gerrit server & GitHub bots enforce CLA compliance instead.

Otherwise, when filing an issue, make sure to answer these five questions:

1. What version of Go are you using (`go version`)?
2. What operating system and processor architecture are you using?
3. What did you do?
4. What did you expect to see?
5. What did you see instead?

For change proposals, see [Proposing Changes To Go](https://go.dev/s/proposal-process).

## Contributing code

pkg net/http/httptest, method (*Server) Certificate() *x509.Certificate
pkg net/http/httptest, method (*Server) Client() *http.Client
pkg reflect, func MakeMapWithSize(Type, int) Value
pkg runtime/pprof, func Do(context.Context, LabelSet, func(context.Context))
pkg runtime/pprof, func ForLabels(context.Context, func(string, string) bool)
pkg runtime/pprof, func Label(context.Context, string) (string, bool)

pkg container/list, type Element struct
pkg container/list, type Element struct, Value interface{}
pkg container/list, type List struct
pkg container/ring, func New(int) *Ring
pkg container/ring, method (*Ring) Do(func(interface{}))
pkg container/ring, method (*Ring) Len() int
pkg container/ring, method (*Ring) Link(*Ring) *Ring
pkg container/ring, method (*Ring) Move(int) *Ring
pkg container/ring, method (*Ring) Next() *Ring

At previous versions (`winsymlink=0`), mount points are treated as symlinks,
and other reparse points with non-default [`os.ModeType`](/pkg/os#ModeType) bits
(such as [`os.ModeDir`](/pkg/os#ModeDir)) do not have the `ModeIrregular` bit set.

Go 1.23 changed [`os.Readlink`](/pkg/os#Readlink) and [`filepath.EvalSymlinks`](/pkg/path/filepath#EvalSymlinks)

pkg syscall (linux-386), const IPV6_MULTICAST_LOOP = 19
pkg syscall (linux-386), const IPV6_NEXTHOP = 9
pkg syscall (linux-386), const IPV6_PKTINFO = 50
pkg syscall (linux-386), const IPV6_PMTUDISC_DO = 2
pkg syscall (linux-386), const IPV6_PMTUDISC_DONT = 0
pkg syscall (linux-386), const IPV6_PMTUDISC_PROBE = 3
pkg syscall (linux-386), const IPV6_PMTUDISC_WANT = 1
pkg syscall (linux-386), const IPV6_RECVDSTOPTS = 58

pkg syscall (linux-arm-cgo), const IPV6_MTU_DISCOVER ideal-int
pkg syscall (linux-arm-cgo), const IPV6_NEXTHOP ideal-int
pkg syscall (linux-arm-cgo), const IPV6_PKTINFO ideal-int
pkg syscall (linux-arm-cgo), const IPV6_PMTUDISC_DO ideal-int
pkg syscall (linux-arm-cgo), const IPV6_PMTUDISC_DONT ideal-int
pkg syscall (linux-arm-cgo), const IPV6_PMTUDISC_PROBE ideal-int
pkg syscall (linux-arm-cgo), const IPV6_PMTUDISC_WANT ideal-int