Fixed parsing of BNF concepts mixed with isaset concepts

tests/core/test_ExecutionContext.py

@@ -121,3 +121,20 @@ def test_i_can_search():
         stop=lambda ec: ec.obj == "skip",
         start_with_self=True,
         get_obj=lambda ec: ec.obj)) == ["obj_abbb"]
+
+
+def test_variables_are_passed_to_children_but_not_to_parents():
+    a = ExecutionContext("foo", Event("event_1"), "fake_sheerka", BuiltinConcepts.NOP, None)
+    assert not hasattr(a, "var")
+
+    b = a.push(BuiltinConcepts.NOP, None, var="foo")
+    assert b.var == "foo"
+    assert not hasattr(a, "var")
+
+    c = b.push(BuiltinConcepts.NOP, None)
+    assert c.var == "foo"
+
+    c.var = "bar"
+    assert c.var == "bar"
+    assert b.var != "bar"
+    assert not hasattr(a, "var")