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Oh sweet! I used to use Scheme. You absolutely could, but the only problem is tooling. When you do anything with compilers or ASTs, there is a lot of boring stuff that you need to take care off, like tracking the original location of the code so you can show nice errors, attach comments somehow to the AST, etc. You will be better off if you choose a language that already has compiler tooling for the language you are targeting, otherwise you will have to rebuild a lot of boring stuff yourself.