Added set of set handling (thru concept ISA)

src/evaluators/EvalEvaluator.py

@@ -29,13 +29,21 @@ class EvalEvaluator(AllReturnValuesEvaluator):
 
         for ret_val in return_values:
             if ret_val.status and isinstance(ret_val.body, Concept) and ret_val.body.body:
-                context.log(self.verbose_log, f"Evaluating {ret_val}", who=self)
+                context.log(self.verbose_log, f"Evaluating {ret_val.body}", who=self)
                 result.append(sheerka.ret(self.name, True, ret_val.body.body, parents=[ret_val, self.eval_requested]))
+            elif ret_val.status and sheerka.isaset(context, ret_val.body):
+                context.log(self.verbose_log, f"Evaluating set {ret_val.body}", who=self)
+                result.append(sheerka.ret(
+                    self.name,
+                    True,
+                    sheerka.get_set_elements(context, ret_val.body),
+                    parents=[ret_val, self.eval_requested]))
 
         if len(result) > 0:
             return result
         else:
             # suppress the successful BuiltinConcepts.CONCEPT_EVAL_REQUESTED
+            # status of CONCEPT_EVAL_REQUESTED is now set to False
             return sheerka.ret(
                 self.name,
                 False,