{"ast_node_type":"variable","tokens":[{"end":83,"kind":"keyword","start":0,"text":"let"}]}
    let target_bindir = PathBuf::from(target_libdir).parent().unwrap().join("bin");
        .context("cannot resolve target-libdir from rustc")?;
    let llvm_profdata = target_bindir.join("llvm-profdata").with_extension(EXE_EXTENSION);