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diff --git a/vendor/twig/twig/doc/templates.rst b/vendor/twig/twig/doc/templates.rst
index d4dbe32d6..3d60779a0 100644
--- a/vendor/twig/twig/doc/templates.rst
+++ b/vendor/twig/twig/doc/templates.rst
@@ -611,7 +611,8 @@ exist:
     { 2: 'foo', 4: 'bar' }
 
     {# keys as expressions (the expression must be enclosed into parentheses) -- as of Twig 1.5 #}
-    { (1 + 1): 'foo', (a ~ 'b'): 'bar' }
+    {% set foo = 'foo' %}
+    { (foo): 'foo', (1 + 1): 'bar', (foo ~ 'b'): 'baz' }
 
 * ``true`` / ``false``: ``true`` represents the true value, ``false``
   represents the false value.