mypy: Enable disallow_incomplete_defs flag for type checking

1 files changed, 2 insertions, 2 deletions

diff --git a/sphinx/writers/html5.py b/sphinx/writers/html5.py
index 8eefab141..7c570d9d6 100644
--- a/sphinx/writers/html5.py
+++ b/sphinx/writers/html5.py
@@ -12,8 +12,8 @@ import os
 import posixpath
 import sys
 import warnings
+from typing import Any, Iterable, Tuple
 from typing import cast
-from typing import Iterable, Tuple
 
 from docutils import nodes
 from docutils.nodes import Element, Node, Text
@@ -45,7 +45,7 @@ class HTML5Translator(SphinxTranslator, BaseTranslator):
 
     builder = None  # type: StandaloneHTMLBuilder
 
-    def __init__(self, *args) -> None:
+    def __init__(self, *args: Any) -> None:
         if isinstance(args[0], nodes.document) and isinstance(args[1], Builder):
             document, builder = args
         else: