Python 3.8 compatibility

loki/bulk/item.py

@@ -1028,6 +1028,28 @@ def ir(self):
                 return decl
         raise RuntimeError(f'Declaration for {local_name} cannot be found in {self.scope_name}')
 
+    # Below properties are only here to appease the Linter and become
+    # redundant once the Item base class has been cleaned up
+    @property
+    def calls(self):
+        pass
+
+    @property
+    def function_interfaces(self):
+        pass
+
+    @property
+    def imports(self):
+        pass
+
+    @property
+    def members(self):
+        pass
+
+    @property
+    def routine(self):
+        pass
+
 
 class SubroutineItem(Item):
     """

tests/test_batch.py

@@ -429,13 +429,13 @@ def test_procedure_item_with_config(here, config, expected_dependencies):
 
     # We need to have suitable dependency modules in the cache to spawn the dependency items
     item_cache = {item.name: item}
-    item_cache |= {
+    item_cache.update({
         (i := get_item(ModuleItem, proj/path, name, RegexParserClass.ProgramUnitClass)).name: i
         for path, name in [
             ('module/t_mod.F90', 't_mod'), ('module/a_mod.F90', 'a_mod'),
             ('module/b_mod.F90', 'b_mod'), ('headers/header_mod.F90', 'header_mod')
         ]
-    }
+    })
     scheduler_config = SchedulerConfig.from_dict(config)
     assert item.create_dependency_items(item_cache=item_cache, config=scheduler_config) == expected_dependencies