Macro dynec::system_test_exported

macro_rules! system_test_exported {
    (
        $($systems:expr),* ;
        $(
            $(let $var:ident :)? $arch:ty = ($($components:tt)*);
        )*
    ) => { ... };
}

Similar to system_test, but returns the entities in the form (world, (ent1, ent2, ...))