Macro moore_vhdl::make_arenas

macro_rules! make_arenas {
    ($(#[$arena_attr:meta])* pub struct $arena_name:ident { $($name:ident: $type:ty,)* }) => { ... };
    ($(#[$arena_attr:meta])* pub struct $arena_name:ident<$($lt:tt),+> { $($name:ident: $type:ty,)* }) => { ... };
    (IMPL $($arena_attr:meta),*; $arena_name:ident; [$($lt:tt),*]; $($name:ident: $type:ty,)*) => { ... };
    (STRUCT_IMPL $arena_name:ident; [$($lt:tt),*]; $($name:ident: $type:ty,)*) => { ... };
    (TRAIT_IMPL $arena_name:ident; [$($lt:tt),*]; $name:ident: $type:ty, $($tail_name:ident: $tail_type:ty,)*) => { ... };
    (TRAIT_IMPL $arena_name:ident; [$($lt:tt),*];) => { ... };
}

Generate a collection of arenas for different types.