Dialyxir.Warnings.MapUpdate (Dialyxir v1.4.8)

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Elixir can only use the map update syntax to update a key that is in the map.

Example

defmodule Example do
  @spec error() :: map
  def error() do
    map = %{exists: :exists}
    %{map | does_not_exist: :fail}
  end
end