Macro load 

macro_rules! load {
    (raw $name: literal, $scale:expr) => { ... };
    (8x $name:literal) => { ... };
    ($name:literal, $scale:expr) => { ... };
    ($name: ident) => { ... };
    ($name: literal) => { ... };
    (from $v:ident which is [$($k:literal $(|)?)+], $scale: ident) => { ... };
    ($scale:ident -> match $v:ident { $($k:pat => $nam:literal $(,)?)+ }) => { ... };
    (concat $x:literal => $v:ident which is [$($k:literal $(|)?)+], $scale: ident) => { ... };
}