Macro map_as_tuple_seq_intern 

macro_rules! map_as_tuple_seq_intern {
    (
        $tyorig:ident < K $(: $kbound1:ident $(+ $kbound2:ident)*)?, V $(, $typaram:ident : $bound1:ident $(+ $bound2:ident)*)* >,
        $with_capacity:expr,
        $ty:ident <(KAs, VAs)>
    ) => { ... };
}