Macro __expand_inner 

macro_rules! __expand_inner {
    ( $ops:ident, add($s:literal); $($rest:tt)* ) => { ... };
    ( $ops:ident, remove($s:literal); $($rest:tt)* ) => { ... };
    ( $ops:ident, add($s:literal) ) => { ... };
    ( $ops:ident, remove($s:literal) ) => { ... };
    ( $ops:ident, ) => { ... };
}