Interpolation Content is Not Recognised

[rajaramghosh]

This code below gives the following message in VSCode ElixirLS, even though both are used in interpolation

variable "conv" is unused (if the variable is not meant to be used, prefix it with an underscore)

and

function status_reason/1 is unused

def full_status(conv) do
    #{conv.status} #{status_reason(conv.status)}
end

defp status_reason(code) do
    %{
      200 => "Ok",
      404 => "Not Found"
    }[code]
end