{"ast_node_type":"variable","tokens":[{"end":71,"kind":"keyword","start":0,"text":"let"}]}
                    let mut err = early_dcx.early_struct_fatal(format!(
                s.parse::<usize>().unwrap_or_else(|_| {
                        r#"`RUST_MIN_STACK` should be a number of bytes, but was "{s}""#,