Macro package 

macro_rules! package {
    ($pkg:literal$(,)? $( $opt:literal ),*) => { ... };
    ($pkg:ident$(,)? $( $opt:ident ),*) => { ... };
}

This, too, could’ve gotten ugly. Package creation with options.

use rust_texas::prelude::*;
package!("amsmath", "<whatever options you want, as literals>");