{"ast_node_type":"other","tokens":[{"end":92,"kind":"keyword","start":0,"text":".map_or_else(Expectation::none,"}]}
                    .map_or_else(Expectation::none, |ty| Expectation::has_type(ty.clone()));
                    .as_ref()
                let rhs_ty = rhs.map(|e| self.infer_expr(e, &rhs_expect, ExprIsRead::Yes));