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``with``
========
Use the ``with`` tag to create a new inner scope. Variables set within this
scope are not visible outside of the scope:
.. code-block:: twig
{% with %}
{% set value = 42 %}
{{ value }} {# value is 42 here #}
{% endwith %}
value is not visible here any longer
Instead of defining variables at the beginning of the scope, you can pass a
mapping of variables you want to define in the ``with`` tag; the previous
example is equivalent to the following one:
.. code-block:: twig
{% with {value: 42} %}
{{ value }} {# value is 42 here #}
{% endwith %}
value is not visible here any longer
{# it works with any expression that resolves to a mapping #}
{% set vars = {value: 42} %}
{% with vars %}
...
{% endwith %}
By default, the inner scope has access to the outer scope context; you can
disable this behavior by appending the ``only`` keyword:
.. code-block:: twig
{% set zero = 0 %}
{% with {value: 42} only %}
{# only value is defined #}
{# zero is not defined #}
{% endwith %}
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