{"ast_node_type":"variable","tokens":[{"end":90,"kind":"keyword","start":0,"text":"let"}]}
    let metadata_tmpdir = MaybeTempDir::new(metadata_tmpdir, tcx.sess.opts.cg.save_temps);
        .unwrap_or_else(|err| tcx.dcx().emit_fatal(FailedCreateTempdir { err }));
    let metadata_filename = metadata_tmpdir.as_ref().join("full.rmeta");