Fixed variable recognition when it is a concept

src/parsers/BaseNodeParser.py

@@ -18,6 +18,12 @@ class ChickenAndEggError(Exception):
     concepts: Set[str]
 
 
+@dataclass
+class NoFirstTokenError(ErrorNode):
+    concept: Concept
+    key: str
+
+
 @dataclass()
 class LexerNode(Node):
     start: int  # starting index in the tokens list
@@ -891,7 +897,7 @@ class BaseNodeParser(BaseParser):
 
             if keywords is None:
                 # no first token found for a concept ?
-                return sheerka.ret(sheerka.name, False, concept)
+                return sheerka.ret(sheerka.name, False, NoFirstTokenError(concept, concept.key))
 
             for keyword in keywords:
                 res.setdefault(keyword, []).append(concept.id)