code: func reportUnconvertedFns(pkg *PkgState, file string, things ...bindgen.FilterFunc) {
  	used := pkg.usedCFn()
  	t, err := bindgen.Parse(bindgen.Model(), file)
  	handleErr(err)
  
  	var allFuncs = make(map[string]struct{})
  	for _, thing := range things {
  		decls, err := bindgen.Get(t, thing)
  		handleErr(err)
  		for _, decl := range decls {
  			name := bindgen.NameOf(decl)
  			allFuncs[name] = struct{}{}
  		}
  
  	}
  	keys := make([]string, 0, len(allFuncs))
  	for k := range allFuncs {
  		keys = append(keys, k)
  	}
  	sort.Strings(keys)
  	fmt.Printf("## Unconverted C Functions ##\n\n")
  	for _, k := range keys {
  		if _, ok := used[k]; !ok {
  			fmt.Printf("* `%v`\n", k)
  		}
  	}
  	fmt.Println()
  }
docs: // find unused/unconverted functions