VintageNet.InterfaceRenamer.rename_interface

You're seeing just the callback rename_interface, go back to VintageNet.InterfaceRenamer module for more information.
Link to this callback

rename_interface(arg1, arg2)

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Specs

rename_interface(VintageNet.ifname(), VintageNet.ifname()) ::
  :ok | {:error, String.t()}