Added chicken and egg recursion detection

src/core/builtin_concepts.py

@@ -51,6 +51,7 @@ class BuiltinConcepts(Enum):
     REDUCE_REQUESTED = "reduce requested"  # remove meaningless error when possible
     NOT_A_SET = "not a set"  # the concept has no entry in sets
     WHERE_CLAUSE_FAILED = "where clause failed"  # failed to validate where clause during evaluation
+    CHICKEN_AND_EGG = "chicken and egg"  # infinite recursion when declaring concept
 
     NODE = "node"
     GENERIC_NODE = "generic node"
@@ -92,7 +93,8 @@ BuiltinErrors = [str(e) for e in {
     BuiltinConcepts.CONCEPT_EVAL_ERROR,
     BuiltinConcepts.CONCEPT_ALREADY_IN_SET,
     BuiltinConcepts.NOT_A_SET,
-    BuiltinConcepts.WHERE_CLAUSE_FAILED
+    BuiltinConcepts.WHERE_CLAUSE_FAILED,
+    BuiltinConcepts.CHICKEN_AND_EGG
 }]
 
 """