Each file is a list of API features, one per line.

go1.txt (and similarly named files) are frozen once a version has been
shipped. Each file adds new lines but does not remove any.

except.txt lists features that may disappear without breaking true
compatibility.

Starting with go1.19.txt, each API feature line must end in "#nnnnn"
giving the GitHub issue number of the proposal issue that accepted

      checkNonNegative(--selfLoopCount);
    }
    N previousNode = inEdgeMap.remove(edge);
    // We're relying on callers to call this method only with an edge that's in the graph.
    return requireNonNull(previousNode);
  }

  @Override
  public N removeOutEdge(E edge) {
    N previousNode = outEdgeMap.remove(edge);
    // We're relying on callers to call this method only with an edge that's in the graph.

    checkNotNull(key);
    checkNotNull(value);
    clearCache();
    return backingMap.put(key, value);
  }

  @CanIgnoreReturnValue
  @CheckForNull
  final V remove(Object key) {
    checkNotNull(key);
    clearCache();
    return backingMap.remove(key);
  }

  final void clear() {
    clearCache();
    backingMap.clear();
  }

  @CheckForNull
  V get(Object key) {
    checkNotNull(key);

            return parent.toArray(a);
        }

        public boolean add(final E e) {
            return parent.add(e);
        }

        public boolean remove(final Object o) {
            return parent.remove(o);
        }

        public boolean containsAll(final Collection<?> c) {
            return parent.containsAll(c);
        }

      }

      <E extends @Nullable Object> void push(List<E> stack, E value) {
        stack.add(value);
      }

      <E extends @Nullable Object> E pop(List<E> stack) {
        return stack.remove(stack.size() - 1);
      }
    };

    abstract <T extends @Nullable Object, A extends @Nullable Object, R extends @Nullable Object>
        A result(Collector<T, A, R> collector, Iterable<T> inputs);
  }

    }

    @Override
    public void transferSucceeded(TransferEvent event) {
        ongoing.remove(new TransferResourceIdentifier(event.getResource()));
        put(event, ongoing.isEmpty());
    }

    @Override
    public void transferFailed(TransferEvent event) {
        ongoing.remove(new TransferResourceIdentifier(event.getResource()));
        put(event, ongoing.isEmpty());
    }

    #; schemaHtmlFileName = xxx.html
    # - - - - - - - - - -/

    # /- - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
    # o isSuppressSchemaHtmlOutsideSql: (NotRequired - Default false)
    #  Does it remove outsideSql information from SchemaHtml?
    #  Basically you don't need this.
    #  OutsideSql information (related to tables) is very useful.
    #
    #; isSuppressSchemaHtmlOutsideSql = false

	}

	// close everything before we delete.
	if err = gw.Close(); err != nil {
		return err
	}

	if err = r.Close(); err != nil {
		return err
	}

	// Attempt to remove after all fd's are closed.
	return os.Remove(oldLgFile)
}

func (w *Writer) rotate() error {
	if w.f != nil {
		if err := w.closeCurrentFile(); err != nil {
			return err
		}

// call of panic. If recover is called outside the deferred function it will
// not stop a panicking sequence. In this case, or when the goroutine is not
// panicking, recover returns nil.
//
// Prior to Go 1.21, recover would also return nil if panic is called with
// a nil argument. See [panic] for details.
func recover() any

// The print built-in function formats its arguments in an

      assertTrue(Thread.holdsLock(mutex));
      delegate.putAll(table);
    }

    @Override
    public @Nullable V remove(Object rowKey, Object columnKey) {
      assertTrue(Thread.holdsLock(mutex));
      return delegate.remove(rowKey, columnKey);
    }

    @Override
    public Map<C, V> row(R rowKey) {
      assertTrue(Thread.holdsLock(mutex));
      return delegate.row(rowKey);