Method expecting

cranelift/module/src/module.rs:543–545

(&self, f: &mut fmt::Formatter)

        type Value = ModuleDeclarationsField;

        fn expecting(&self, f: &mut fmt::Formatter) -> fmt::Result {
            f.write_str("field identifier")
        }

        fn visit_u64<E: Error>(self, val: u64) -> Result<Self::Value, E> {
            match val {