&gt; What you showed looks nice and useful, but I would not consider it new syntax.<p>You&#x27;re the only one, then.<p>&gt; Is it possible to use this technique, say, infix arithmetic operators<p>Take a look: <a href="http:&#x2F;&#x2F;srfi.schemers.org&#x2F;srfi-110&#x2F;srfi-110.html#examples" rel="nofollow">http:&#x2F;&#x2F;srfi.schemers.org&#x2F;srfi-110&#x2F;srfi-110.html#examples</a>