From d61383eef28aeef5aa4549e9fd53fb4acc0a4855 Mon Sep 17 00:00:00 2001
From: Ivan Levkivskyi <levkivskyi@gmail.com>
Date: Sun, 11 Jun 2023 21:08:12 +0100
Subject: [PATCH] Always allow returning Any from lambda (#15413)

---
 mypy/checker.py                 |  1 +
 test-data/unit/check-flags.test | 11 +++++++++++
 2 files changed, 12 insertions(+)

diff --git a/mypy/checker.py b/mypy/checker.py
index c1c31538b7de..4593d5164b3d 100644
--- a/mypy/checker.py
+++ b/mypy/checker.py
@@ -4270,6 +4270,7 @@ def check_return_stmt(self, s: ReturnStmt) -> None:
                             isinstance(return_type, Instance)
                             and return_type.type.fullname == "builtins.object"
                         )
+                        and not is_lambda
                     ):
                         self.msg.incorrectly_returning_any(return_type, s)
                     return
diff --git a/test-data/unit/check-flags.test b/test-data/unit/check-flags.test
index 4a43224260d1..6ec0849146c0 100644
--- a/test-data/unit/check-flags.test
+++ b/test-data/unit/check-flags.test
@@ -2184,3 +2184,14 @@ def f(x: bytes, y: bytearray, z: memoryview) -> None:
 follow_imports = skip
 follow_imports_for_stubs = true
 [builtins fixtures/dict.pyi]
+
+[case testReturnAnyLambda]
+# flags: --warn-return-any
+from typing import Any, Callable
+
+def cb(f: Callable[[int], int]) -> None: ...
+a: Any
+cb(lambda x: a)  # OK
+
+fn = lambda x: a
+cb(fn)