Fix #8992: autodoc: Failed to resolve types.TracebackType type annotation

The builtin module, ``types.TracebackType`` does not have correct module
name.  This allows to refer it automatically.

CHANGES

@@ -89,6 +89,7 @@ Bugs fixed
 * #8917: autodoc: Raises a warning if function has wrong __globals__ value
 * #8415: autodoc: a TypeVar imported from other module is not resolved (in
   Python 3.7 or above)
+* #8992: autodoc: Failed to resolve types.TracebackType type annotation
 * #8905: html: html_add_permalinks=None and html_add_permalinks="" are ignored
 * #8380: html search: Paragraphs in search results are not identified as ``<p>``
 * #8915: html theme: The translation of sphinx_rtd_theme does not work

sphinx/util/typing.py

@@ -11,6 +11,7 @@
 import sys
 import typing
 from struct import Struct
+from types import TracebackType
 from typing import Any, Callable, Dict, Generator, List, Optional, Tuple, TypeVar, Union
 
 from docutils import nodes
@@ -42,6 +43,13 @@ if False:
     from typing import Type  # NOQA # for python3.5.1
 
 
+# builtin classes that have incorrect __module__
+INVALID_BUILTIN_CLASSES = {
+    Struct: 'struct.Struct',  # Before Python 3.9
+    TracebackType: 'types.TracebackType',
+}
+
+
 # Text like nodes which are initialized with text and rawsource
 TextlikeNode = Union[nodes.Text, nodes.TextElement]
 
@@ -101,9 +109,8 @@ def restify(cls: Optional["Type"]) -> str:
         return ':obj:`None`'
     elif cls is Ellipsis:
         return '...'
-    elif cls is Struct:
+    elif cls in INVALID_BUILTIN_CLASSES:
-        # Before Python 3.9, struct.Struct class has incorrect __module__.
+        return ':class:`%s`' % INVALID_BUILTIN_CLASSES[cls]
-        return ':class:`struct.Struct`'
     elif inspect.isNewType(cls):
         return ':class:`%s`' % cls.__name__
     elif types_Union and isinstance(cls, types_Union):
@@ -276,14 +283,13 @@ def stringify(annotation: Any) -> str:
         return repr(annotation)
     elif annotation is NoneType:
         return 'None'
+    elif annotation in INVALID_BUILTIN_CLASSES:
+        return INVALID_BUILTIN_CLASSES[annotation]
     elif (getattr(annotation, '__module__', None) == 'builtins' and
           hasattr(annotation, '__qualname__')):
         return annotation.__qualname__
     elif annotation is Ellipsis:
         return '...'
-    elif annotation is Struct:
-        # Before Python 3.9, struct.Struct class has incorrect __module__.
-        return 'struct.Struct'
 
     if sys.version_info >= (3, 7):  # py37+
         return _stringify_py37(annotation)

tests/test_util_typing.py

@@ -11,6 +11,7 @@
 import sys
 from numbers import Integral
 from struct import Struct
+from types import TracebackType
 from typing import (Any, Callable, Dict, Generator, List, NewType, Optional, Tuple, TypeVar,
                     Union)
 
@@ -45,6 +46,7 @@ def test_restify():
     assert restify(None) == ":obj:`None`"
     assert restify(Integral) == ":class:`numbers.Integral`"
     assert restify(Struct) == ":class:`struct.Struct`"
+    assert restify(TracebackType) == ":class:`types.TracebackType`"
     assert restify(Any) == ":obj:`Any`"
 
 
@@ -133,7 +135,8 @@ def test_stringify():
     assert stringify(str) == "str"
     assert stringify(None) == "None"
     assert stringify(Integral) == "numbers.Integral"
-    assert restify(Struct) == ":class:`struct.Struct`"
+    assert stringify(Struct) == "struct.Struct"
+    assert stringify(TracebackType) == "types.TracebackType"
     assert stringify(Any) == "Any"