Don't worry, they're the easy kind, nothing to do with hygiene...

1. The standard library has a handful of macros you can't import from the crate root. The ones I know are std::pin::pin! and std::mem::offset_of!. User crates can't do that in stable Rust, right?

2. It seems like #[macro_use] and #[macro_export] and the above restriction could all be forgotten if Rust allowed pub on macro_rules! macros. (I'm imagining it would cause the macro to have path-based scope.) Is there some reason that wouldn't work?

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