field declaration. An empty tag string is equivalent to an absent tag.
The tags are made visible through a <a href="/pkg/reflect/#StructTag">reflection interface</a>
and take part in <a href="#Type_identity">type identity</a> for structs
but are otherwise ignored.
</p>

<pre>
struct {
	x, y float64 ""  // an empty tag string is like an absent tag
	name string  "any string is permitted as a tag"

implementation of Go.  This grant does not include claims that would be
infringed only as a consequence of further modification of this
implementation.  If you or your agent or exclusive licensee institute or
order or agree to the institution of patent litigation against any
entity (including a cross-claim or counterclaim in a lawsuit) alleging

field declaration. An empty tag string is equivalent to an absent tag.
The tags are made visible through a <a href="/pkg/reflect/#StructTag">reflection interface</a>
and take part in <a href="#Type_identity">type identity</a> for structs
but are otherwise ignored.
</p>

<pre>
struct {
	x, y float64 ""  // an empty tag string is like an absent tag
	name string  "any string is permitted as a tag"

// license that can be found in the LICENSE file.

#include <assert.h>
#include <stdlib.h>
#include <string.h>
#include "_cgo_export.h"

/* Test calling a Go function with multiple return values.  */

void
callMulti(void)
{
	struct multi_return result = multi();
	assert(strcmp(result.r0, "multi") == 0);
	assert(result.r1 == 0);
	free(result.r0);

pkg syscall (freebsd-riscv64), type RtMetrics struct, Locks uint64 #53466
pkg syscall (freebsd-riscv64), type RtMetrics struct, Mtu uint64 #53466
pkg syscall (freebsd-riscv64), type RtMetrics struct, Pksent uint64 #53466
pkg syscall (freebsd-riscv64), type RtMetrics struct, Recvpipe uint64 #53466
pkg syscall (freebsd-riscv64), type RtMetrics struct, Rtt uint64 #53466

	#line 1 "not-str-lit"
	void __cgo_f_1_5(void) { static const char __cgo_undefined__5[] = (foo); }

This program will not compile, but cgo can use the presence or absence
of an error message on a given line to deduce the information it
needs. The program is syntactically valid regardless of whether each
name is a type or an ordinary identifier, so there will be no syntax

	AESDECLAST X11, X11                     // 66450f38dfdb
	AESENC (BX), X2                         // 660f38dc13
	AESENC (R11), X2                        // 66410f38dc13
	AESENC X2, X2                           // 660f38dcd2
	AESENC X11, X2                          // 66410f38dcd3
	AESENC (BX), X11                        // 66440f38dc1b
	AESENC (R11), X11                       // 66450f38dc1b
	AESENC X2, X11                          // 66440f38dcda

	// We used to look at specific warning or error messages here, but that tied the
	// behavior too closely to specific versions of the compilers.
	// Instead, arrange that we can infer what we need from only the presence or absence
	// of an error on a specific line.
	//
	// For each name, we generate these lines, where xxx is the index in toSniff plus one.
	//
	//	#line xxx "not-declared"

pkg syscall (darwin-arm64), type RtMetrics struct, Locks uint32
pkg syscall (darwin-arm64), type RtMetrics struct, Mtu uint32
pkg syscall (darwin-arm64), type RtMetrics struct, Pksent uint32
pkg syscall (darwin-arm64), type RtMetrics struct, Recvpipe uint32
pkg syscall (darwin-arm64), type RtMetrics struct, Rtt uint32
pkg syscall (darwin-arm64), type RtMetrics struct, Rttvar uint32

pkg syscall (freebsd-arm64), type RtMetrics struct, Locks uint64
pkg syscall (freebsd-arm64), type RtMetrics struct, Mtu uint64
pkg syscall (freebsd-arm64), type RtMetrics struct, Pksent uint64
pkg syscall (freebsd-arm64), type RtMetrics struct, Recvpipe uint64
pkg syscall (freebsd-arm64), type RtMetrics struct, Rtt uint64
pkg syscall (freebsd-arm64), type RtMetrics struct, Rttvar uint64