{"ast_node_type":"variable","tokens":[{"end":67,"kind":"keyword","start":0,"text":"let"}]}
                let (dest, dest_len) = self.project_to_simd(dest)?;
                let (input, input_len) = self.project_to_simd(&args[0])?;
                assert_eq!(input_len, dest_len, "Return vector length must match input length");