Module.reserved_attributes

You're seeing just the function reserved_attributes, go back to Module module for more information.
Link to this function

reserved_attributes()

View Source (since 1.12.0)

Returns information about module attributes used by Elixir.

See the "Module attributes" section in the module documentation for more information on each attribute.

Examples

iex> map = Module.reserved_attributes()
iex> Map.has_key?(map, :moduledoc)
true
iex> Map.has_key?(map, :doc)
true