/**
     * Configure a single client scoped listener that will receive all analytic events for this
     * client.
     *
     * @see EventListener for semantics and restrictions on listener implementations.
     */
    fun eventListener(eventListener: EventListener) =
      apply {
        this.eventListenerFactory = eventListener.asFactory()
      }

    /**

        def providerWithSideEffect = Providers.of(someValue()).withSideEffect(sideEffect)
        // `PropertyInternal` does not directly provide these setters,
        // but all user-facing interfaces and their implementations do.
        property."$setter"(providerWithSideEffect)

        property.calculateValue(ValueSupplier.ValueConsumer.IgnoreUnsafeRead)
        property.calculateExecutionTimeValue()

        then:

var (
	// ErrNotSupported indicates that a feature is not supported.
	//
	// It is returned by ResponseController methods to indicate that
	// the handler does not support the method, and by the Push method
	// of Pusher implementations to indicate that HTTP/2 Push support
	// is not available.
	ErrNotSupported = &ProtocolError{"feature not supported"}

	// Deprecated: ErrUnexpectedTrailer is no longer returned by

		// Remove cached version info.
		xremove(pathf("%s/VERSION.cache", goroot))

		// Remove distribution packages.
		xremoveall(pathf("%s/pkg/distpack", goroot))
	}
}

/*
 * command implementations
 */

// The env command prints the default environment.
func cmdenv() {
	path := flag.Bool("p", false, "emit updated PATH")
	plan9 := flag.Bool("9", gohostos == "plan9", "emit plan 9 syntax")

// frameworkImpl.
type extensionPoint struct {
	// the set of plugins to be configured at this extension point.
	plugins *config.PluginSet
	// a pointer to the slice storing plugins implementations that will run at this
	// extension point.
	slicePtr interface{}
}

func (f *frameworkImpl) getExtensionPoints(plugins *config.Plugins) []extensionPoint {
	return []extensionPoint{

		close(reqInFlight) // cause the client to cancel its request

		select {
		case <-time.After(10 * time.Second):
			// Note: this should only happen in broken implementations, and the
			// closenotify case should be instantaneous.
			t.Error("Handler never saw CloseNotify")
			return
		case <-w.(http.CloseNotifier).CloseNotify():
		}

		w.WriteHeader(http.StatusOK)