Added set of set handling (thru concept ISA)

src/core/sheerka/Services/SheerkaEvaluateConcept.py

@@ -235,6 +235,12 @@ class SheerkaEvaluateConcept:
                         concept.set_prop(prop_name, resolved)
             else:
                 part_key = ConceptParts(metadata_to_eval)
+
+                # do not evaluate where when the body is a set
+                # Indeed, the way that the where clause is expressed is not a valid python or concept code
+                if part_key == ConceptParts.WHERE and self.sheerka.isaset(context, concept.body):
+                    continue
+
                 if part_key in concept.compiled and concept.compiled[part_key] is not None:
                     metadata_ast = concept.compiled[part_key]
                     resolved = self.resolve(context, metadata_ast, part_key, concept, logger)
@@ -244,7 +250,7 @@ class SheerkaEvaluateConcept:
                         concept.values[part_key] = self.get_infinite_recursion_resolution(resolved) or resolved
 
         # validate where clause
-        if concept.metadata.where is not None:
+        if ConceptParts.WHERE in concept.values:
             where_value = concept.values[ConceptParts.WHERE]
             if not (where_value is None or self.sheerka.value(where_value) is True):
                 return self.sheerka.new(BuiltinConcepts.WHERE_CLAUSE_FAILED, body=concept)