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With the recent release of Arc, there has been some discussion over hygienic macros. Yes, hygienic macros are usually very convenient, but they can become messy in some ‘corner’ cases. People who learn about macros in Scheme usually start with syntax-rules, and being the limited tool that it is, they often get the impression that for advanced uses (like a macro that captures an identifier) you need to use syntax-case which is this “really obscure thing”.