{"ast_node_type":"variable","tokens":[{"end":85,"kind":"keyword","start":0,"text":"let"}]}
                let opt_ty = expected.to_option(self).and_then(|ty| match ty.kind() {
            ast::LitKind::Int(i, ast::LitIntType::Unsuffixed) => {
                    ty::Int(_) | ty::Uint(_) => Some(ty),