pkg syscall (netbsd-arm64-cgo), const IP_MINTTL ideal-int
pkg syscall (netbsd-arm64-cgo), const IP_MSS = 576
pkg syscall (netbsd-arm64-cgo), const IP_MSS ideal-int
pkg syscall (netbsd-arm64-cgo), const IP_MULTICAST_IF = 9
pkg syscall (netbsd-arm64-cgo), const IP_MULTICAST_LOOP = 11
pkg syscall (netbsd-arm64-cgo), const IP_MULTICAST_TTL = 10
pkg syscall (netbsd-arm64-cgo), const IP_OFFMASK = 8191

as if it had a "vendor/" prefix. For example, within "crypto/tls",
an import of "golang.org/x/crypto/cryptobyte" resolves to
"vendor/golang.org/x/crypto/cryptobyte". When a package with the
same path is imported from a package outside std or cmd, it will
be resolved normally. Consequently, a binary may be built with two
copies of a package at different versions if the package is

	GOOS=ios GOARCH=amd64 CGO_ENABLED=1 CC_FOR_TARGET=$(pwd)/../misc/ios/clangwrap.sh ./all.bash

If CC_FOR_TARGET is not set when the toolchain is built (make.bash or all.bash), CC
can be set on the command line. For example,

	GOOS=ios GOARCH=amd64 CGO_ENABLED=1 CC=$(go env GOROOT)/misc/ios/clangwrap.sh go build

Setting CC is not necessary if the toolchain is built with CC_FOR_TARGET set.

If the argument to [FileInfoHeader] implements the new [FileInfoNames]
interface, then the interface methods will be used to set the Uname/Gname
of the file header. This allows applications to override the system-dependent

pkg syscall (darwin-arm64), const IPV6_BINDV6ONLY = 27
pkg syscall (darwin-arm64), const IPV6_BINDV6ONLY ideal-int
pkg syscall (darwin-arm64), const IPV6_BOUND_IF = 125
pkg syscall (darwin-arm64), const IPV6_BOUND_IF ideal-int
pkg syscall (darwin-arm64), const IPV6_CHECKSUM = 26
pkg syscall (darwin-arm64), const IPV6_CHECKSUM ideal-int
pkg syscall (darwin-arm64), const IPV6_DEFAULT_MULTICAST_HOPS = 1

pkg syscall (freebsd-arm64), const IP_MSFILTER ideal-int
pkg syscall (freebsd-arm64), const IP_MSS = 576
pkg syscall (freebsd-arm64), const IP_MSS ideal-int
pkg syscall (freebsd-arm64), const IP_MULTICAST_IF = 9
pkg syscall (freebsd-arm64), const IP_MULTICAST_LOOP = 11
pkg syscall (freebsd-arm64), const IP_MULTICAST_TTL = 10
pkg syscall (freebsd-arm64), const IP_MULTICAST_VIF = 14

pkg syscall, const IPV6_MULTICAST_HOPS ideal-int
pkg syscall, const IPV6_MULTICAST_IF ideal-int
pkg syscall, const IPV6_MULTICAST_LOOP ideal-int
pkg syscall, const IPV6_UNICAST_HOPS ideal-int
pkg syscall, const IPV6_V6ONLY ideal-int
pkg syscall, const IP_ADD_MEMBERSHIP ideal-int
pkg syscall, const IP_DROP_MEMBERSHIP ideal-int
pkg syscall, const IP_MULTICAST_IF ideal-int
pkg syscall, const IP_MULTICAST_LOOP ideal-int

+ No Markdown
+ The first PR comment (this one) is wrapped at 76 characters, unless it's
  really needed (ASCII art, table, or long link)
+ If there is a corresponding issue, add either `Fixes #1234` or `Updates #1234`
  (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`

It is the work of hundreds of contributors. We appreciate your help!

## Before filing an issue

If you are unsure whether you have found a bug, please consider asking in the [golang-nuts mailing
list](https://groups.google.com/forum/#!forum/golang-nuts) or [other forums](https://golang.org/help/) first. If
the behavior you are seeing is confirmed as a bug or issue, it can easily be re-raised in the issue tracker.

## Filing issues

which are tied to a specific release.
-->

## Introduction {#intro}

Go's emphasis on backwards compatibility is one of its key strengths.
There are, however, times when we cannot maintain complete compatibility.
If code depends on buggy (including insecure) behavior,
then fixing the bug will break that code.
New features can also have similar impacts:
enabling the HTTP/2 use by the HTTP client broke programs