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From time to time you need a custom expander. Like when you need to perform some analysis or optimization on an already expanded code before you pass it on to the compiler. Read on to see a rather simple example of such expander.

It's been already almost three years since the work on deforestation in the Qi compiler has commenced. And an interesting idea started floating around lately: would it be possible to provide deforestation benefits to more users? Such as users of the threading macro?

Sometimes it is necessary to use syntax context of macro use site. For example when explicitly relying on the outer expression context for honoring modified application semantics.

Although it has been more than a year since Qi 5 was released, the work on deforastation in qi/list has steadily progressed forward finally yielding an (almost) unified interface for defining new deforestable operations.

Sometimes you are working on a research and you need to manage BibTeX bibliography. However as the number of entries grows it becomes harder to manage. There has to be a better way.