While <i>Grammars as a language feature</i> aren&#x27;t mainstream (yet!) they&#x27;re not a unique feature either.<p>For eg.  See the <i>parse dialect</i> which is a TDPL that comes with Rebol &#x2F; Red<p>- <a href="http:&#x2F;&#x2F;www.rebol.com&#x2F;docs&#x2F;core23&#x2F;rebolcore-15.html" rel="nofollow">http:&#x2F;&#x2F;www.rebol.com&#x2F;docs&#x2F;core23&#x2F;rebolcore-15.html</a><p>- <a href="https:&#x2F;&#x2F;en.wikibooks.org&#x2F;wiki&#x2F;REBOL_Programming&#x2F;Language_Features&#x2F;Parse&#x2F;Parse_expressions" rel="nofollow">https:&#x2F;&#x2F;en.wikibooks.org&#x2F;wiki&#x2F;REBOL_Programming&#x2F;Language_Fea...</a><p>- <a href="http:&#x2F;&#x2F;www.red-lang.org&#x2F;2013&#x2F;11&#x2F;041-introducing-parse.html" rel="nofollow">http:&#x2F;&#x2F;www.red-lang.org&#x2F;2013&#x2F;11&#x2F;041-introducing-parse.html</a>