Tree tree = new Tree(
                        left: new Tree([:]),
                        right: new Tree([:])
                    )

                public static class Tree {
                    @Optional @Nested
                    Tree left

                    @Optional @Nested
                    Tree right

                    String nonAnnotated
                }

/**
 * The result of a file download operation.
 *
 * @since 7.3
 */
public interface FileDownloadResult extends OperationResult {
    /**
     * Returns the total download size. Note that this might not be the same as the file size.
     */
    long getBytesDownloaded();

```Python hl_lines="5-6"
{!../../../docs_src/dependencies/tutorial007.py!}
```

!!! tip
    You can use `async` or regular functions.

    **FastAPI** will do the right thing with each, the same as with normal dependencies.

## A dependency with `yield` and `try`

If you use a `try` block in a dependency with `yield`, you'll receive any exception that was thrown when using the dependency.

	// an integer modulo N. This is the absolute worst of all worlds: we still
	// have to reduce, because the result might still overflow N, but to take
	// the left-most bits for P-521 we have to do a right shift.
	if size := c.N.Size(); len(hash) >= size {
		hash = hash[:size]
		if excess := len(hash)*8 - c.N.BitLen(); excess > 0 {
			hash = bytes.Clone(hash)

delimiter (by default "{{") is followed immediately by a minus sign and white
space, all trailing white space is trimmed from the immediately preceding text.
Similarly, if the right delimiter ("}}") is preceded by white space and a minus
sign, all leading white space is trimmed from the immediately following text.
In these trim markers, the white space must be present:

 */

package org.gradle.internal.component.model;

import javax.annotation.Nullable;

/**
 * Represents the 'name' part of an Ivy artifact, independent of which module version the artifact might belong to.
 */
public interface IvyArtifactName {
    String getName();

    String getType();

    @Nullable
    String getExtension();

    @Nullable
    String getClassifier();

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

// Make sure we don't get an index out of bounds error
// while trying to print a map that is concurrently modified.
// The runtime might complain (throw) if it detects the modification,
// so we have to run the test as a subprocess.

package main

import (
	"os/exec"
	"strings"
)

func main() {

	Sleep(sched)
	waitDone(done)
	tim.Stop()
	close(stop)
	waitDone(done1)
	waitDone(done2)
	if isTicker {
		// extra send might have sent done again
		// (handled by buffering done above).
		select {
		default:
		case <-done:
		}
		// extra send after that might have filled C.
		select {
		default:
		case <-C:
		}
	}
	notDone(done)

	// Test enqueueTimerChan when timer is stopped.

	if baseCT, _, _ := mime.ParseMediaType(resCT); baseCT == "text/event-stream" {
		return -1 // negative means immediately
	}

	// We might have the case of streaming for which Content-Length might be unset.
	if res.ContentLength == -1 {
		return -1
	}

	return p.FlushInterval
}

At that point, by noticing that the server took some microseconds longer to send the "Incorrect username or password" response, the attackers will know that they got _something_ right, some of the initial letters were right.

And then they can try again knowing that it's probably something more similar to `stanleyjobsox` than to `johndoe`.

#### A "professional" attack