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``deprecated``
==============
Twig generates a deprecation notice (via a call to the ``trigger_error()``
PHP function) where the ``deprecated`` tag is used in a template:
.. code-block:: twig
{# base.twig #}
{% deprecated 'The "base.twig" template is deprecated, use "layout.twig" instead.' %}
{% extends 'layout.twig' %}
You can also deprecate a macro in the following way:
.. code-block:: twig
{% macro welcome(name) %}
{% deprecated 'The "welcome" macro is deprecated, use "hello" instead.' %}
...
{% endmacro %}
Note that by default, the deprecation notices are silenced and never displayed nor logged.
See :ref:`deprecation-notices` to learn how to handle them.
.. note::
Don't use the ``deprecated`` tag to deprecate a ``block`` as the
deprecation cannot always be triggered correctly.
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