Struct Native 

pub struct Native {
    pub name: &'static str,
    pub fingerprints: &'static [(usize, u64)],
    pub executes: bool,
    pub run: fn(&mut Engine, &[TokenList]) -> bool,
}

A native implementation of one macro definition.

Fields

name: &'static str

The macro’s usual name, for diagnostics and RETEX_NATIVE_DEBUG.

fingerprints: &'static [(usize, u64)]

The definitions it implements: (number of tokens of parameter text, end-of-match and body; fingerprint).

executes: bool

Whether it performs assignments or other non-expandable actions (else it only puts tokens back into the input, like an expandable macro).

run: fn(&mut Engine, &[TokenList]) -> bool

Runs the implementation on the scanned arguments; false to let the TeX definition run instead (with nothing changed).