Macro poly 

macro_rules! poly {
    ($name:ident) => { ... };
    ($name:ident ^ $exp:literal) => { ... };
    ($c:literal) => { ... };
    ($c:literal * $name:ident) => { ... };
    ($c:literal * $name:ident ^ $exp:literal) => { ... };
}

Convenience macro for building polynomials.