{"ast_node_type":"function","tokens":[{"end":84,"kind":"keyword","start":0,"text":"//"}]}
        // fn arguments. `Self` may be passed via (im)mutable reference or by-value.
        // Initial signature is `fn(&? Self, Args) -> Self::Output` where `Args` is a tuple of the
        assert_eq!(inputs_and_output.len(), 3);