Revert "skip type annotations for 3.7, which fails for unknown reasons"

This reverts commit 59c3f83.

sphinx_autodoc_typehints.py

@@ -265,10 +265,8 @@ def _is_dataclass(name: str, what: str, qualname: str) -> bool:
 
 
 def _future_annotations_imported(obj):
-    if sys.version_info < (3, 8):
-        # Only Python ≥ 3.7 supports PEP563, however
-        # Python 3.7 doesn't give the expected results.
-        # TODO: make it work for Python 3.7.
+    if sys.version_info < (3, 7):
+        # Only Python ≥ 3.7 supports PEP563.
         return False
 
     _annotations = getattr(inspect.getmodule(obj), "annotations", None)

tests/test_sphinx_autodoc_typehints.py

@@ -266,8 +266,7 @@ def test_sphinx_output(app, status, warning, always_document_param_types):
 
     app.config.always_document_param_types = always_document_param_types
     app.config.autodoc_mock_imports = ['mailbox']
-    if sys.version_info < (3, 8):
-        # TODO: fix for Python 3.7
+    if sys.version_info < (3, 7):
         app.config.autodoc_mock_imports.append('dummy_module_future_annotations')
     app.build()
 
@@ -560,8 +559,7 @@ class dummy_module.DataClass(x)
         assert text_contents == maybe_fix_py310(expected_contents)
 
 
-# TODO: fix for Python 3.7, which *should* work but fails for unknown reasons
-@pytest.mark.skipif(sys.version_info < (3, 8),
+@pytest.mark.skipif(sys.version_info < (3, 7),
                     reason="Future annotations are not implemented in Python < 3.7")
 @pytest.mark.sphinx('text', testroot='dummy')
 @patch('sphinx.writers.text.MAXWIDTH', 2000)