Macro declare_annotations 

macro_rules! declare_annotations {
    ( $( $(#[$attr:meta])* $name:ident = $val:expr ;)+ ) => { ... };
}

Declares a set of SalukiAnnotation constants and generates a companion ALL slice.

Each entry declares one named pub const annotation. The macro also emits:

pub const ALL: &[&SalukiAnnotation] = &[&NAME1, &NAME2, ...];

so that annotations_index.rs can aggregate submodules with a single v.extend_from_slice(my_module::ALL) line rather than listing every constant by name.