Macro decl_test_relay_chains

macro_rules! decl_test_relay_chains {
    (
		$(
			#[api_version($api_version:tt)]
			pub struct $name:ident {
				genesis = $genesis:expr,
				on_init = $on_init:expr,
				runtime = $runtime:ident,
				core = {
					SovereignAccountOf: $sovereign_acc_of:path,
				},
				pallets = {
					$($pallet_name:ident: $pallet_path:path,)*
				}
			}
		),
		+
		$(,)?
	) => { ... };
}