statement, or a possibly labeled <a href="#Fallthrough_statements">"fallthrough"
	    statement</a>.</li>
	</ul>
</li>

<li>
	A <a href="#Select_statements">"select" statement</a> in which:
	<ul>
	<li>there are no "break" statements referring to the "select" statement, and</li>
	<li>the statement lists in each case, including the default if present,
	    end in a terminating statement.</li>
	</ul>
</li>

	Example:
	//go:cgo_ldflag "-lpthread"
	//go:cgo_ldflag "-L/usr/local/sqlite3/lib"

A package compiled with cgo will include directives for both
internal and external linking; the linker will select the appropriate
subset for the chosen linking mode.

Example

As a simple example, consider a package that uses cgo to call C.sin.
The following code will be generated by cgo:

	// compiled by gc

	return 0, nil
}

func TestZeroReader(t *testing.T) {
	var z zeroReader
	r := NewReader(z)

	c := make(chan error)
	go func() {
		_, err := r.ReadByte()
		c <- err
	}()

	select {
	case err := <-c:
		if err == nil {
			t.Error("error expected")
		} else if err != io.ErrNoProgress {
			t.Error("unexpected error:", err)
		}
	case <-time.After(time.Second):

pkg syscall (darwin-arm64), type Dirent struct
pkg syscall (darwin-arm64), type Dirent struct, Ino uint64
pkg syscall (darwin-arm64), type Dirent struct, Name [1024]int8
pkg syscall (darwin-arm64), type Dirent struct, Namlen uint16
pkg syscall (darwin-arm64), type Dirent struct, Pad_cgo_0 [3]uint8
pkg syscall (darwin-arm64), type Dirent struct, Reclen uint16

pkg syscall (freebsd-arm64), type Dirent struct
pkg syscall (freebsd-arm64), type Dirent struct, Fileno uint64
pkg syscall (freebsd-arm64), type Dirent struct, Name [256]int8
pkg syscall (freebsd-arm64), type Dirent struct, Namlen uint16
pkg syscall (freebsd-arm64), type Dirent struct, Off int64
pkg syscall (freebsd-arm64), type Dirent struct, Pad0 uint8
pkg syscall (freebsd-arm64), type Dirent struct, Pad1 uint16

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
connecting to servers with buggy HTTP/2 implementations.
These kinds of changes are unavoidable and
[permitted by the Go 1 compatibility rules](/doc/go1compat).
Even so, Go provides a mechanism called GODEBUG to

// function breaks the input into lines with line termination stripped. [Scanner.Split]
// functions are defined in this package for scanning a file into
// lines, bytes, UTF-8-encoded runes, and space-delimited words. The
// client may instead provide a custom split function.
//
// Scanning stops unrecoverably at EOF, the first I/O error, or a token too
// large to fit in the [Scanner.Buffer]. When a scan stops, the reader may have

pkg syscall (freebsd-riscv64), type Dirent struct #53466
pkg syscall (freebsd-riscv64), type Dirent struct, Fileno uint64 #53466
pkg syscall (freebsd-riscv64), type Dirent struct, Name [256]int8 #53466
pkg syscall (freebsd-riscv64), type Dirent struct, Namlen uint16 #53466
pkg syscall (freebsd-riscv64), type Dirent struct, Off int64 #53466
pkg syscall (freebsd-riscv64), type Dirent struct, Pad0 uint8 #53466

	    statement, or a possibly labeled <a href="#Fallthrough_statements">"fallthrough"
	    statement</a>.</li>
	</ul>
</li>

<li>
	A <a href="#Select_statements">"select" statement</a> in which:
	<ul>
	<li>there are no "break" statements referring to the "select" statement, and</li>
	<li>the statement lists in each case, including the default if present,
	    end in a terminating statement.</li>
	</ul>
</li>

pkg syscall (freebsd-386), const O_CLOEXEC = 0
pkg syscall (freebsd-386), func Fchflags(string, int) error
pkg syscall (freebsd-386), func Mknod(string, uint32, int) error
pkg syscall (freebsd-386), type Dirent struct, Fileno uint32
pkg syscall (freebsd-386), type Dirent struct, Namlen uint8
pkg syscall (freebsd-386), type Stat_t struct, Blksize uint32
pkg syscall (freebsd-386), type Stat_t struct, Dev uint32
pkg syscall (freebsd-386), type Stat_t struct, Gen uint32