code: func (entries Entries) Find(filename string) *Entry {
  	extension := filepath.Ext(filename)
  	// Read-Only no locks needed, at serve/runtime-time the library is not supposed to add new template engines
  	for i, n := 0, len(entries); i < n; i++ {
  		e := entries[i]
  		if e.Loader.Extension == extension {
  			return e
  		}
  	}
  	return nil
  }
docs: // Find receives a filename, gets its extension and returns the template engine responsible for that file extension