Create an example of the Cache structure

lib/ex_example/cache_result.ex

@@ -10,8 +10,9 @@ defmodule ExExample.CacheResult do
     I represent the result of a completed Example Computation
     """
 
+    field(:arguments, Macro.input() | nil, default: nil)
     field(:source, Macro.input())
-    field(:source_name, atom())
+    field(:source_name, {module(), atom(), non_neg_integer()})
     field(:result, term())
     field(:pure, boolean())
   end

lib/ex_example/examples/e_cache_result.ex

@@ -0,0 +1,16 @@
+defmodule ExExample.Examples.ECacheResult do
+  alias ExExample.CacheResult
+
+  def trivial_definition() do
+    5
+  end
+
+  def trivial_cached_result do
+    %CacheResult{
+      source: [do: 5],
+      pure: true,
+      result: 5,
+      source_name: {__MODULE__, :trivial_definition, 0}
+    }
+  end
+end