The syntax 'X' is deprecated; use 'Y' instead. 'X' deprecated in this position; consider using 'Y' instead.
where X is the form supported in older versions of the language, Y
the recommended form.
Obsolete forms of the language do not require white space in some
areas where it is required in newer versions. Additionally, some older
operator names have been replaced by newer forms. Deprecated syntax is
subject to eventual removal from the language.