code: @Inline(value="$1.add($2)")
  	public static <E> boolean operator_add(Collection<? super E> collection, E value) {
  		return collection.add(value);
  	}
docs: The operator mapping from {@code +=} to {@link Collection#add(Object)}. Returns <code>true</code> if the
  collection changed due to this operation.
  
  @param collection
  the to-be-changed collection. May not be <code>null</code>.
  @param value
  the value that should be added to the collection.
  @return <code>true</code> if the collection changed due to this operation.
  @see Collection#add(Object)