There is possibility to get list of custom macro attribute usings?
I.E. I want to get all structs in project that are marked by something like #[MyAttribute] and use it in macro code.
In a macro? Fundamentally no, because macros can generate their own structs, so you can't get "all".
What you may want to do instead is change #[MyAttribute] to #[derive(MyThing)], since then you get to run your custom derive on every such type. It's still each type separately, though -- you won't get the full set.
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