* provided null elements.
   */
  public Joiner skipNulls() {
    return new Joiner(this) {
      @Override
      @SuppressWarnings("JoinIterableIterator") // suggests infinite recursion
      public String join(Iterable<?> parts) {
        return join(parts.iterator());
      }

      @Override
      public <A extends Appendable> A appendTo(A appendable, Iterator<?> parts) throws IOException {

import java.util.List;
import java.util.SortedSet;
import java.util.stream.Stream;
import org.jspecify.annotations.NonNull;
import org.jspecify.annotations.Nullable;

/**
 * A discouraged (but not deprecated) precursor to Java's superior {@link Stream} library.
 *
 * <p>The following types of methods are provided:
 *
 * <ul>
 *   <li>chaining methods which return a new {@code FluentIterable} based in some way on the

func (f *File) walk(x interface{}, context astContext, visit func(*File, interface{}, astContext)) {
	visit(f, x, context)
	switch n := x.(type) {
	case *ast.Expr:
		f.walk(*n, context, visit)

	// everything else just recurs
	default:
		f.walkUnexpected(x, context, visit)

	case nil:

	// These are ordered and grouped to match ../../go/ast/ast.go
	case *ast.Field:
		if len(n.Names) == 0 && context == ctxField {

* Add translation to Portuguese for [Features - Recursos](https://fastapi.tiangolo.com/pt/features/). PR [#1248](https://github.com/tiangolo/fastapi/pull/1248) by [@marcosmmb](https://github.com/marcosmmb).

      }
      ExampleStackTrace found = allowedPriorLocks.get(node);
      if (found != null) {
        return found; // Found a path ending at the node!
      }
      // Recurse the edges.
      for (Entry<LockGraphNode, ExampleStackTrace> entry : allowedPriorLocks.entrySet()) {
        LockGraphNode preAcquiredLock = entry.getKey();
        found = preAcquiredLock.findPathTo(node, seen);

    try {
      closingFuture.finishToValueAndCloser(new NoOpValueAndCloserConsumer<>(), executor);
      fail();
    } catch (IllegalStateException expected) {
    }
  }

  // Avoid infinite recursion if a closeable's close() method throws RejectedExecutionException and
  // is closed using the direct executor.
  public void testCloseThrowsRejectedExecutionException() throws Exception {

					Remove(storeFilePath)
					// try again
					Remove(deletePath)
				}
			}
			// Ignore errors if the directory is not empty. The server relies on
			// this functionality, and sometimes uses recursion that should not
			// error on parent directories.
			return nil
		case osIsNotExist(err):
			return nil
		case errors.Is(err, errFileNotFound):
			return nil
		case osIsPermission(err):