cognitive psychology. PhD 
Can any of my followers explain to me/point me to info on the current status of Rust’s proc macro implementation? I’ve never actually written any Rust, I just observe from afar, but I have a vested interest in macrology, and I’d like to better understand the Rust macro status quo
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I think you should start here: https://doc.rust-lang.org/proc_macro/struct.Span.html … and here:https://github.com/rust-lang/rfcs/pull/1681 …
Also dtolnay's libraries and resources are valuable. Proc macro tutorial: https://github.com/dtolnay/proc-macro-workshop … Syn (tokens -> AST): https://github.com/dtolnay/syn Quote (quasi-quote):https://github.com/dtolnay/quote
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I think unfortunately there aren't any resources that answer Alexis' question, which might be rephrased as "what do Span::call_site and ::mixed_site do", preferably explained in terms of the literature on macros.
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Yes, and furthermore, I’d also really like to understand (a) whether the current system is being actively worked on, (b) what its recent history is and why its particular design tradeoffs were chosen, and (c) how Rust users and rustc developers feel about its current state.
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