dev: don't raise warning on rendered exceptions

CHANGELOG.md

@@ -19,6 +19,11 @@ You can find our backwards-compatibility policy [here](https://github.com/hynek/
 
 - Python 3.8 support.
 
+### Changed
+
+- `structlog.dev.ConsoleRenderer` does not warn anymore when the `exception` key has a rendered value despite having a fancy formatter configured.
+  [#790](https://github.com/hynek/structlog/pull/790)
+
 
 ## [25.5.0](https://github.com/hynek/structlog/compare/25.4.0...25.5.0) - 2025-10-27
 

src/structlog/dev.py

@@ -915,13 +915,6 @@ def __call__(
         if exc_info:
             self._exception_formatter(sio, exc_info)
         elif exc is not None:
-            if self._exception_formatter is not plain_traceback:
-                warnings.warn(
-                    "Remove `format_exc_info` from your processor chain "
-                    "if you want pretty exceptions.",
-                    stacklevel=2,
-                )
-
             sio.write("\n" + exc)
 
         return sio.getvalue()

tests/test_dev.py

@@ -358,37 +358,17 @@ def test_key_values_unsorted(self, styles, padded):
             + styles.reset
         ) == rv
 
-    @pytest.mark.parametrize("wrap", [True, False])
-    def test_exception_rendered(
-        self, cr, recwarn, wrap, styles, padded, monkeypatch
-    ):
+    def test_exception_rendered(self, cr, styles, padded):
         """
         Exceptions are rendered after a new line if they are already rendered
         in the event dict.
-
-        A warning is emitted if exception printing is "customized".
         """
         exc = "Traceback:\nFake traceback...\nFakeError: yolo"
 
-        # Wrap the formatter to provoke the warning.
-        if wrap:
-            monkeypatch.setattr(
-                cr,
-                "_exception_formatter",
-                lambda s, ei: dev.plain_traceback(s, ei),  # noqa: PLW0108
-            )
-
         rv = cr(None, None, {"event": "test", "exception": exc})
 
         assert (f"{padded}\n" + exc) == rv
 
-        if wrap:
-            (w,) = recwarn.list
-            assert (
-                "Remove `format_exc_info` from your processor chain "
-                "if you want pretty exceptions.",
-            ) == w.message.args
-
     def test_stack_info(self, cr, styles, padded):
         """
         Stack traces are rendered after a new line.