I can now use keyword in concept definition and parsing

tests/parsers/test_ExactConceptParser.py

@@ -161,6 +161,32 @@ class TestExactConceptParser(TestUsingMemoryBasedSheerka):
         assert concept_found.metadata.need_validation
         assert not concept_found.metadata.is_evaluated
 
+    def test_i_can_parse_when_expression_contains_keyword(self):
+        sheerka, context, isa, def_concept = self.init_concepts(
+            Concept("c is a concept").def_var("c"),
+            Concept("def concept a").def_var("a"),
+        )
+
+        source = "z is a concept"
+        results = ExactConceptParser().parse(context, source)
+        concept_found = results[0].value.value
+
+        assert len(results) == 1
+        assert results[0].status
+        assert concept_found == CMV(isa, c="z")
+        assert concept_found.metadata.need_validation
+        assert not concept_found.metadata.is_evaluated
+
+        source = "def concept z"
+        results = ExactConceptParser().parse(context, source)
+        concept_found = results[0].value.value
+
+        assert len(results) == 1
+        assert results[0].status
+        assert concept_found == CMV(def_concept, a="z")
+        assert concept_found.metadata.need_validation
+        assert not concept_found.metadata.is_evaluated
+
     def test_i_can_manage_unknown_concept(self):
         context = self.get_context(self.get_sheerka(singleton=True))
         source = "def concept hello"  # this is not a concept by itself