What does the hyphen mean for a block in Twig like in {% block body -%}?

problem ：

When generating a CRUD in a Symfony2 application with Doctrine commands, generated Twig template content is defined within a Twig block this way: Use Doctrine Command in Symfony2 Generate... In the application CRUD when , Generated Twig The template content is displayed in this way Twig Block defines ：

{% block body -%}{% endblock %}

What does the hyphen in -%} mean? A hyphen -%} What does that mean? ？It works fine without the hyphen and I could not find anything similar in the Twig documentation. No hyphens it works , I am here Twig Nothing like this could be found in the document .

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Solution ：

Reference resources ： https://stackoom.com/en/question/1AaEY