Macro generate_stubgen 

macro_rules! generate_stubgen {
    ($name:ident, $decl:ty, $is_impl:literal) => { ... };
}

Generate “tests”, which will generate solidity code on execution and print it to stdout Script at .maintain/scripts/generate_api.sh can split this output from test runtime

This macro receives type usage as second argument, but you can use anything as generics, because no bounds are implied