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-rw-r--r--src/jinja2/runtime.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/jinja2/runtime.py b/src/jinja2/runtime.py
index 557460f..ca49db7 100644
--- a/src/jinja2/runtime.py
+++ b/src/jinja2/runtime.py
@@ -755,7 +755,7 @@ class Undefined:
__floordiv__ = __rfloordiv__ = _fail_with_undefined_error
__mod__ = __rmod__ = _fail_with_undefined_error
__pos__ = __neg__ = _fail_with_undefined_error
- __call__ = __getitem__ = _fail_with_undefined_error
+ __call__ = __getitem__ = __contains__ = _fail_with_undefined_error
__lt__ = __le__ = __gt__ = __ge__ = _fail_with_undefined_error
__int__ = __float__ = __complex__ = _fail_with_undefined_error
__pow__ = __rpow__ = _fail_with_undefined_error