Merge pull request #717 from vsbogd/fix-python-match

Fix exception on matching Python and Rust grounded atoms

python/hyperon/atoms.py

@@ -216,7 +216,10 @@ def _priv_compare_value_atom(gnd, catom):
     """
     if hp.atom_get_metatype(catom) == AtomKind.GROUNDED:
         atom = GroundedAtom(catom)
-        return gnd == atom.get_object()
+        try:
+            return gnd == atom.get_object()
+        except TypeError:
+            return False
     else:
         return False
 

python/tests/test_metta.py

@@ -68,3 +68,17 @@ def test_runner_error(self):
             self.assertTrue(False, "Parse error expected")
         except RuntimeError as e:
             self.assertEqual(e.args[0], 'Unexpected end of expression')
+
+    def test_match_with_rust_grounded_atom(self):
+        program = '''
+          ; True is used as a Python grounded object
+          (grounded True)
+          ; import! is used as a Rust grounded object which can be
+          ; received from Python
+          !(match &self (grounded import!) Ok)
+        '''
+        runner = MeTTa(env_builder=Environment.test_env())
+        result = runner.run(program)
+
+        self.assertEqual([[]], result)
+