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.