{"ast_node_type":"other","tokens":[{"end":83,"kind":"keyword","start":0,"text":".unwrap_or_else(|err|"}]}
        .unwrap_or_else(|err| tcx.dcx().emit_fatal(FailCreateFileEncoder { err }));
    let mut encoder = opaque::FileEncoder::new(path)
    encoder.emit_raw_bytes(METADATA_HEADER);