Fixed some bugs

tests/non_reg/test_sheerka_non_reg.py

@@ -1091,6 +1091,39 @@ as:
         assert res[0].status
         assert res[0].body
 
+    def test_i_can_evaluate_source_code_with_concept(self):
+        init = [
+            "def concept the a ret a",
+        ]
+
+        sheerka = self.init_scenario(init)
+        res = sheerka.evaluate_user_input("desc(the a)")
+
+        assert len(res) == 1
+        assert res[0].status
+
+    def test_i_can_parse_concept_with_variables_using_short_name(self):
+        init = [
+            "def concept foo from a foo b where a,b",
+            "def concept bar from bar a where a",
+            "def concept baz from a baz where a",
+        ]
+
+        sheerka = self.init_scenario(init)
+        res = sheerka.evaluate_user_input("desc(foo)")
+        assert len(res) == 1
+        assert res[0].status
+
+        sheerka = self.init_scenario(init)
+        res = sheerka.evaluate_user_input("desc(bar)")
+        assert len(res) == 1
+        assert res[0].status
+
+        sheerka = self.init_scenario(init)
+        res = sheerka.evaluate_user_input("desc(baz)")
+        assert len(res) == 1
+        assert res[0].status
+
 
 class TestSheerkaNonRegFile(TestUsingFileBasedSheerka):
     def test_i_can_def_several_concepts(self):