Use the with tag to create a new inner scope. Variables set within this scope are not visible outside of the scope:

{% with %}
  {% set foo = 42 %}
  {{ foo }} {# foo is 42 here #}
{% endwith %}

{# foo is not visible here any longer #}

Instead of defining variables at the beginning of the scope, you can pass a hash of variables you want to define in the with tag; the previous example is equivalent to the following one:

{% with { foo: 42 } %}
  {{ foo }} {# foo is 42 here #}
{% endwith %}

{# foo is not visible here any longer #}

{# it works with any expression that resolves to a hash #}
{% set vars = { foo: 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:

{% set bar = 'bar' %}
{% with { foo: 42 } only %}
  {# only foo is defined #}
  {# bar is not defined #}
{% endwith %}

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