I can now use keyword in concept definition and parsing

src/parsers/BaseNodeParser.py

@@ -6,7 +6,7 @@ import core.utils
 from core.builtin_concepts import BuiltinConcepts
 from core.concept import VARIABLE_PREFIX, Concept, DEFINITION_TYPE_BNF, ConceptParts
 from core.sheerka.ExecutionContext import ExecutionContext
-from core.tokenizer import TokenKind, LexerError, Token
+from core.tokenizer import TokenKind, LexerError, Token, Keywords
 from parsers.BaseParser import Node, BaseParser, ErrorNode
 
 DEBUG_COMPILED = True
@@ -440,7 +440,7 @@ class CN(HelperWithPos):
         self.concept = concept if isinstance(concept, Concept) else None
 
     def fix_source(self, str_tokens):
-        self.source = "".join(str_tokens)
+        self.source = "".join([s.value if isinstance(s, Keywords) else s for s in str_tokens])
         return self
 
     def __eq__(self, other):