{"ast_node_type":"other","tokens":[{"end":48,"kind":"keyword","start":0,"text":"if"}]}
    if env::var_os("RUST_BACKTRACE").is_none() {
    // (e.g. `RUST_BACKTRACE=1`)
        // HACK: this check is extremely dumb, but we don't really need it to be smarter since this should only happen in the test suite anyway.