Macro marine::init_wasm_func_once

macro_rules! init_wasm_func_once {
    ($func:ident, $ctx:ident, $args:ty, $rets:ty, $func_name:ident, $ret_error_code: expr) => { ... };
}

Initialize Wasm function in form of Box<RefCell<Option<Func<’static, args, rets>>>> only once.