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Why does Twig extend tag sometimes not see some variables?

In Symfony2, I created a simple action:

public function testAction()
{        
    return $this->render('TestBundle::test.html.twig', array(
        'testBool'    => true,
        'testTplPath' => 'TestBundle::base.html.twig'
    ));
}

base.html.twig:

<html><body>{% block content %}{% endblock %}</body></html>

And now I have a problem with the tag extends in test.html.twig my template, if I use a simple string in the tag as follows: {% extends 'TestBundle::base.html.twig' %}everything is working fine, but it is not working properly {% extends testTplPath %}. The second example is mistake Variable "testTplPath" does not exist in TestBundle::test.html.twig at line 1.

This works great: {% extends testBool ? 'TestBundle::base.html.twig' : 'blah' %}

This throws an exception: {% extends testBool ? testTplPath : 'blah' %}- Variable "testBool" does not exist in TestBundle::test.html.twig at line 1(note that Twig throws this exception during a variable testBool- why ?!)

According to the TWIG documentation, all abowe examples should work, and I don't know what I did wrong.

I have done many tests, and I can’t determine any pattern when variables see excerpts and when not.

Twig v1.16.0 Symfony 2.5.4

: , , testTplPath , , Variable "[first var in expression]" does not exist, : Unable to find template "TestBundle::SomeInvalidTemplate.html.twig".

+4
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test.html.twig , , , ... https://github.com/symfony/symfony/issues/5284 , ​​. {% form_theme [_self, form_theme]%}, .

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