Resolve issue 305 (#307)

Resolves #305

CHANGELOG.md

@@ -1,5 +1,9 @@
 # Changelog
 
+## [Unreleased]
+
+- Fix a `Field list ends without a blank line` warning (issue 305).
+
 ## 1.21.5
 
 - More robust determination of rtype location / fix issue 302

src/sphinx_autodoc_typehints/__init__.py

@@ -758,6 +758,9 @@ def _inject_rtype(
 
     formatted_annotation = format_annotation(type_hints["return"], app.config)
 
+    if r.found_param and insert_index < len(lines) and lines[insert_index].strip() != "":
+        insert_index -= 1
+
     if insert_index == len(lines) and not r.found_param:
         # ensure that :rtype: doesn't get joined with a paragraph of text
         lines.append("")

tests/test_integration.py

@@ -874,6 +874,41 @@ def func_with_definition_list() -> int:
     # See https://github.com/tox-dev/sphinx-autodoc-typehints/issues/302
 
 
+@expected(
+    """\
+mod.decorator_2(f)
+
+   Run the decorated function with *asyncio.run*.
+
+   Parameters:
+      **f** ("Any") -- The function to wrap.
+
+   Return type:
+      "Any"
+
+   -[ Examples ]-
+
+      A
+"""
+)
+def decorator_2(f: Any) -> Any:
+    """Run the decorated function with `asyncio.run`.
+
+    Parameters
+    ----------
+    f
+        The function to wrap.
+
+    Examples
+    --------
+
+    .. code-block:: python
+
+        A
+    """
+    f
+
+
 AUTO_FUNCTION = ".. autofunction:: mod.{}"
 AUTO_CLASS = """\
 .. autoclass:: mod.{}
@@ -914,5 +949,5 @@ def test_integration(app: SphinxTestApp, status: StringIO, warning: StringIO, mo
     try:
         assert result.strip() == dedent(expected).strip()
     except Exception:
-        print("Result was:\n", result, "\n\n")
+        print(f"Result was:\n{result}\n\n")
         raise