If we look at macros in Scheme R7RS they are mostly transformers on patterns. ->...

If we look at macros in Scheme R7RS they are mostly transformers on patterns. -> https://standards.scheme.org/corrected-r7rs/r7rs-Z-H-6.html#...

> If your not careful to use facilities like gensym and packages it easy to accidentally capture already binded terms at call site.

Luckily CL programmers have heard about that and are usually careful about that.