return false
	case "gccgo":
		return gccgoSearch.isStandard(path)
	default:
		panic("unknown compiler " + compiler)
	}
}

// gccgoSearch holds the gccgo search directories.
type gccgoDirs struct {
	once sync.Once
	dirs []string
}

// gccgoSearch is used to check whether a gccgo package exists in the
// standard library.
var gccgoSearch gccgoDirs

	"unsafe"
	_ "unsafe" // go:linkname
)

// A Setting is a single setting in the $GODEBUG environment variable.
type Setting struct {
	name string
	once sync.Once
	*setting
}

type setting struct {
	value          atomic.Pointer[value]
	nonDefaultOnce sync.Once
	nonDefault     atomic.Uint64
	info           *godebugs.Info
}

type value struct {
	text   string
	bisect *bisect.Matcher
}

// than once for the same mux will result in a panic.
func InstallLivezHandler(mux mux, checks ...HealthChecker) {
	InstallPathHandler(mux, "/livez", checks...)
}

// InstallPathHandler registers handlers for health checking on
// a specific path to mux. *All handlers* for the path must be
// specified in exactly one call to InstallPathHandler. Calling
// InstallPathHandler more than once for the same path and mux will

}

// Open enables telemetry data writing to disk.
// This is supposed to be called once during the program execution
// (i.e. typically in TestMain), and must not be used with
// golang.org/x/telemetry/counter.Open.
func Open(telemetryDir string) {
	openedMu.Lock()
	defer openedMu.Unlock()
	if opened {
		panic("Open was called more than once")
	}
	telemetry.Default = telemetry.NewDir(telemetryDir)

	counter.Open()

// Do not use directly with Compare.
const Future = ""

// AtLeast reports whether the file version v comes after a Go release.
//
// Use this predicate to enable a behavior once a certain Go release
// has happened (and stays enabled in the future).
func AtLeast(v, release string) bool {
	if v == Future {
		return true // an unknown future version is always after y.
	}

import java.util.concurrent.Future;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.locks.Condition;
import java.util.concurrent.locks.ReentrantLock;

/**
 * A queueing mechanism that only executes items once certain conditions are reached.
 */
// TODO This class, DefaultBuildOperationQueue and ExecutionPlan have many of the same
// behavior and concerns - we should look for a way to generalize this pattern.

@LocalOnly
class FileSystemWatchingSettingsFinalizedBuildOperationIntegrationTest extends AbstractFileSystemWatchingIntegrationTest {

    def operations = new BuildOperationsFixture(executer, temporaryFolder)

    def "emits once when not used"() {
        given:
        settingsFile << "includeBuild 'plugin'"
        file("buildSrc/src/main/java/Thing.java") << "class Thing {}"
        createDir("plugin") {
            file("settings.gradle") << ""

import org.apache.maven.project.ProjectBuilder;

/**
 * This realizes the metadata source via the default hint to provide backward-compat with Maven 2.x whose Plexus version
 * registered component descriptors twice: once keyed by role+roleHint and once keyed by role only. This effectively
 * made the metadata source available with its original role hint ("maven") as well as the default hint.
 *
 */
@Named
@Singleton
@Deprecated

@Requires(IntegTestPreconditions.NotConfigCached)
class ConfigurationCacheSettingsFinalizedBuildOperationIntegTest extends AbstractIntegrationSpec {

    def operations = new BuildOperationsFixture(executer, temporaryFolder)

    def "emits once when not used"() {
        given:
        settingsFile << "includeBuild 'plugin'"
        file("buildSrc/src/main/java/Thing.java") << "class Thing {}"
        createDir("plugin") {
            file("settings.gradle") << ""

     * the build process and provide it to the worker.
     */
    FilteringClassLoader.Spec getGradleApiFilterSpec();

    /**
     * Returns the extension classloader spec for use in worker processes.  This is expensive to calculate, so we create it once in
     * the build process and provide it to the worker.
     */