Writing macro_rules macros by hand really does give me the "programming is writing weird gibberish"-feel.
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Static if does this
Also the only reason it's not practical is because of an RFC that prevents macros from redefining themselves. I may or may not have once explored having the `table!` macro in Diesel redefine itself to avoid the need to manually call `allow_tables_to_appear_in_same_query!`
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I think we need to write an RFC to recant said RFC
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I'd be on board. Macros are just closures and if they can't re-assign variables (which might be themselves) what are we even doing here
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