What do you suggest proc macros to be aware of each other as opposed to a static variable?

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Proc macros should be expandable independently and without any side effects. We don't offer any guarantees around the order and amount of times a proc macro is expanded. For example rust-analyzer will only re-expand proc macros if you change the actual invocation of the proc macro. Rustc could also start caching proc macro outputs in the future I think.