Macro probor::_probor_decode_variant

macro_rules! _probor_decode_variant {
    ($typ:ident, $dec:expr, $len:expr, $variant:ident) => { ... };
    ($typ:ident, $dec:expr, $len: expr, $variant:ident,
    $( $fname:ident $fnum:tt ),+) => { ... };
}