This PR was merged into the 1.x branch.
Discussion
----------
Throw exception on circular reference detection
Out-the-box this isn't common... but into Symfony framework this kind of issue can happen frequently when we're overriding a template from third-party bundle (see main issue https://github.com/symfony/symfony/issues/17557)
```twig
{# app/Resources/AcmeBlogBundle/views/Blog/index.html.twig #}
{% extends '@AcmeBlog/Blog/index.html.twig' %}
{% block title 'New Title' %}
```
This exception avoids inifite loop or maximum execution time for this case, by detecting a recursive loading when a template extends from itself, thinking to override the parent template which has the same namespace + template name.
Commits
-------
074e1fbe Throw exception on circular reference detection
This PR was submitted for the 2.x branch but it was merged into the 1.x branch instead (closes#2531).
Discussion
----------
Update .travis.yml to deal with missing xdebug config
lets see if this fixes the nightly test
Commits
-------
1097685b Update .travis.yml
This PR was submitted for the 2.x branch but it was merged into the 1.x branch instead (closes#2515).
Discussion
----------
Update internals.rst
Missing an opening paren
Commits
-------
b8967bd3 Update internals.rst
This PR was merged into the 1.x branch.
Discussion
----------
Fix deprecation when using Twig_Profiler_Dumper_Html
Commits
-------
aebec7d8 fixed deprecation when using Twig_Profiler_Dumper_Html
This PR was submitted for the 2.x branch but it was merged into the 1.x branch instead (closes#2512).
Discussion
----------
Issue in documentation for twig number formatter
The explaination below my change is correct. Just the output is not correct
Commits
-------
54f0f7ae Create number_format.rst
This PR was merged into the 1.x branch.
Discussion
----------
Add support for runtime loaders to IntegrationTestCase
Adds the ability to provide runtime loaders in `IntegrationTestCase`. Otherwise, there's no way to test extensions that use them.
Fixes#2492
Commits
-------
ff96b34a Add support for runtime loaders to IntegrationTestCase
This PR was merged into the 1.x branch.
Discussion
----------
Move class_exists() at the bottom of files
Fixes#2503Closes#2506
Commits
-------
95e912b0 Move class_exists() at the bottom of files
This PR was merged into the 1.x branch.
Discussion
----------
Use class_exists instead of require
I think this is required for https://github.com/symfony/symfony/pull/23073 to pass. It's probably very similar to https://github.com/symfony/symfony/pull/22657.
A simple reproducer:
```php
<?php
use Twig\Node\Node;
require_once __DIR__ . '/vendor/autoload.php';
new Node();
new \Twig_Node();
```
[Without this patch](https://travis-ci.org/symfony/symfony/jobs/239712676#L2100):
```php
PHP Fatal error: Cannot declare class Twig_Node, because the name is already in use in vendor/twig/twig/lib/Twig/Node.php on line 20
```
With, everything works fine, whatever the two calls order.
Commits
-------
2c174e40 Use class_exists instead of require
Fabien Potencier
Yonel Ceruto
SpacePossum
Steven Pribilinskiy
simsim2006
Edi Modrić
Nicolas Grekas
Maxime Steinhausser