Macro interstice_module 

macro_rules! interstice_module {
    () => { ... };
    (visibility: $vis:ident) => { ... };
    (authorities: [$($auth:ident),* $(,)?]) => { ... };
    (visibility: $vis:ident, authorities: [$($auth:ident),* $(,)?]) => { ... };
    (@impl_authority Input) => { ... };
    (@impl_authority Gpu) => { ... };
}