Are all attributes in Rust implemented as Macros? Or some native attributes are created specially by the compiler/language and does not use the Macros mechanism?
If there are attributes not created via Macros, how do I identify them?
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Relevant: https://stackoverflow.com/q/69725428 – E_net4 Aug 28 '22 at 09:16
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Why do you want to identify them? – hkBst Aug 28 '22 at 10:18
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There are many attributes that are not macros and are treated specifically by the compiler. Examples: #[cfg] (although this one can be considered as a macro, even if not implemented as one), #[repr], #[doc], #[allow(...)]/#[warn(...)]/#[deny(...)]/#[forbid(...)], and many more.
I don't know a way to identify such attributes except to look at the list of builtin macro attributes and see if they're there.
Chayim Friedman
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just not sure how the source code you pointed to show the list of builtin macro attributes, because from the look of things, it does not look like it – Finlay Weber Aug 28 '22 at 14:50
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@FinlayWeber It is. This is the code in the compiler responsible to register them and their expander. – Chayim Friedman Aug 28 '22 at 20:05