{"ast_node_type":"variable","tokens":[{"end":91,"kind":"keyword","start":0,"text":"let"}]}
        let (formal_input_tys, expected_input_tys) = if tuple_arguments == TupleArguments {
        // If the arguments should be wrapped in a tuple (ex: closures), unwrap them here
            let tuple_type = self.structurally_resolve_type(call_span, formal_input_tys[0]);