File.write_stat-exclamation-mark

You're seeing just the function write_stat-exclamation-mark, go back to File module for more information.

write_stat!(path, stat, opts \\ [])

write_stat!(Path.t(), File.Stat.t(), stat_options()) :: :ok

Same as write_stat/3 but raises a File.Error exception if it fails. Returns :ok otherwise.