-In old Emacs versions, before version 19.29, @samp{`} used a different
-syntax which required an extra level of parentheses around the entire
-backquote construct. Likewise, each @samp{,} or @samp{,@@} substitution
-required an extra level of parentheses surrounding both the @samp{,} or
-@samp{,@@} and the following expression. The old syntax required
-whitespace between the @samp{`}, @samp{,} or @samp{,@@} and the
-following expression.
-
-This syntax is still accepted, for compatibility with old Emacs
-versions, but support for it will be removed in the future.
-