Macro matrix 

macro_rules! matrix {
    () => { ... };
    (;$domain:expr) => { ... };
    ($x:expr) => { ... };
    ($x:expr;$domain:expr) => { ... };
    ([$($x:tt)*] $(, [$($xs:tt)*])* $(,)?) => { ... };
    ([$($x:tt)*] $(, [$($xs:tt)*])* ; [$domain:expr $(, $domains:expr)+ $(,)?]) => { ... };
    ($($x:expr),*) => { ... };
    ($($x:expr),*;$domain:expr) => { ... };
    ($($x:expr,)*) => { ... };
    ($($x:expr,)*;$domain:expr) => { ... };
}

Creates a new matrix AbstractLiteral optionally with some index domain.

• matrix![a,b,c]
• matrix![a,b,c;my_domain]
• matrix![[a, b, c], [d, e, f]]
• matrix![[a, b, c], [d, e, f]; [domain_1, domain_2]]

To create one from a (Rust) vector, use [into_matrix!].

To create a matrix Literal (wrapping elements with Literal::from), use matrix_lit!.