Fix false positive for the unnecessary-ellipsis checker

ChangeLog

@@ -41,6 +41,10 @@ Release date: TBA
 
   Closes #6028
 
+* Fix false positive for the ``unnecessary-ellipsis`` checker when an ellipsis is used in a lambda expression.
+
+  Closes #6036
+
 
 What's New in Pylint 2.13.3?
 ============================

pylint/checkers/ellipsis_checker.py

@@ -43,7 +43,13 @@ def visit_const(self, node: nodes.Const) -> None:
             node.pytype() == "builtins.Ellipsis"
             and not isinstance(
                 node.parent,
-                (nodes.Assign, nodes.AnnAssign, nodes.Call, nodes.Arguments),
+                (
+                    nodes.Assign,
+                    nodes.AnnAssign,
+                    nodes.Call,
+                    nodes.Arguments,
+                    nodes.Lambda,
+                ),
             )
             and (
                 len(node.parent.parent.child_sequence(node.parent)) > 1

tests/functional/u/unnecessary/unnecessary_ellipsis.py

@@ -101,3 +101,6 @@ def __getitem__(self, index: Union[int, slice]) -> Union[int, List[int]]:
 # Ellipsis is allowed as a default argument
 def func_with_ellipsis_default_arg(a = ...) -> None:
     "Some docstring."
+
+# Ignore if the ellipsis is used with a lambda expression
+print("x", lambda: ...)