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Let's write a macro in Rust

Macros are required to do some very helpful things in Rust, but this isn’t an article about any of those things. I became ennamored with macros many years ago when I read Practical Common Lisp and saw the implementation of a SQL DSL that works with built in data structures. The whole implementation took less than a screen of code and absolutely blew away my expectations of what it took to create DSLs.

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