locate async iterator errors to the collection

Replicates graphql/graphql-js@bd558cb

Author: Cito

src/graphql/execution/execute.py

@@ -1275,15 +1275,9 @@ async def complete_async_iterator_value(
                 except StopAsyncIteration:
                     break
             except Exception as raw_error:
-                self.handle_field_error(
-                    raw_error,
-                    item_type,
-                    field_group,
-                    item_path,
-                    incremental_data_record,
-                )
-                completed_results.append(None)
-                break
+                raise located_error(
+                    raw_error, field_group, path.as_list()
+                ) from raw_error
             if complete_list_item_value(
                 value,
                 completed_results,
@@ -1897,27 +1891,28 @@ async def execute_stream_async_iterator_item(
         info: GraphQLResolveInfo,
         item_type: GraphQLOutputType,
         incremental_data_record: StreamItemsRecord,
+        path: Path,
         item_path: Path,
     ) -> Any:
         """Execute stream iterator item."""
         if async_iterator in self._canceled_iterators:
             raise StopAsyncIteration
         try:
             item = await anext(async_iterator)
+        except StopAsyncIteration as raw_error:
+            incremental_data_record.set_is_completed_async_iterator()
+            raise StopAsyncIteration from raw_error
+        except Exception as raw_error:
+            raise located_error(raw_error, field_group, path.as_list()) from raw_error
+        try:
             completed_item = self.complete_value(
                 item_type, field_group, info, item_path, item, incremental_data_record
             )
-
             return (
                 await completed_item
                 if self.is_awaitable(completed_item)
                 else completed_item
             )
-
-        except StopAsyncIteration as raw_error:
-            incremental_data_record.set_is_completed_async_iterator()
-            raise StopAsyncIteration from raw_error
-
         except Exception as raw_error:
             self.handle_field_error(
                 raw_error, item_type, field_group, item_path, incremental_data_record
@@ -1952,6 +1947,7 @@ async def execute_stream_async_iterator(
                     info,
                     item_type,
                     incremental_data_record,
+                    path,
                     item_path,
                 )
             except StopAsyncIteration:

tests/execution/test_lists.py

@@ -210,8 +210,8 @@ async def list_field():
             raise RuntimeError("bad")
 
         assert await _complete(list_field()) == (
-            {"listField": ["two", "4", None]},
-            [{"message": "bad", "locations": [(1, 3)], "path": ["listField", 2]}],
+            {"listField": None},
+            [{"message": "bad", "locations": [(1, 3)], "path": ["listField"]}],
         )
 
     @pytest.mark.asyncio()

tests/execution/test_stream.py

@@ -893,10 +893,10 @@ async def friend_list(_info):
                 {
                     "message": "bad",
                     "locations": [{"line": 3, "column": 15}],
-                    "path": ["friendList", 1],
+                    "path": ["friendList"],
                 }
             ],
-            "data": {"friendList": [{"name": "Luke", "id": "1"}, None]},
+            "data": {"friendList": None},
         }
 
     @pytest.mark.asyncio()
@@ -929,13 +929,13 @@ async def friend_list(_info):
             {
                 "incremental": [
                     {
-                        "items": [None],
+                        "items": None,
                         "path": ["friendList", 1],
                         "errors": [
                             {
                                 "message": "bad",
                                 "locations": [{"line": 3, "column": 15}],
-                                "path": ["friendList", 1],
+                                "path": ["friendList"],
                             },
                         ],
                     },