Merge branch '2.7' into 2.8

* 2.7:
  [travis] Add PHP 7 to allowed failures until segfaults are fixed
  [Intl] Fix test
  [Translator][fallback catalogues] fixed circular reference.
  bumped Symfony version to 2.3.33
  updated VERSION for 2.3.32
  update CONTRIBUTORS for 2.3.32
  updated CHANGELOG for 2.3.32
  [FrameworkBundle] Fix templating.helper.code.file_link_format when defined by ini setting
  [console] Use the description when no help is available

Author: nicolas-grekas

MessageCatalogue.php

@@ -190,6 +190,13 @@ public function addCatalogue(MessageCatalogueInterface $catalogue)
     public function addFallbackCatalogue(MessageCatalogueInterface $catalogue)
     {
         // detect circular references
+        $c = $catalogue;
+        while ($c = $c->getFallbackCatalogue()) {
+            if ($c->getLocale() === $this->getLocale()) {
+                throw new \LogicException(sprintf('Circular reference detected when adding a fallback catalogue for locale "%s".', $catalogue->getLocale()));
+            }
+        }
+
         $c = $this;
         do {
             if ($c->getLocale() === $catalogue->getLocale()) {

Tests/MessageCatalogueTest.php

@@ -127,7 +127,7 @@ public function testAddFallbackCatalogue()
     /**
      * @expectedException \LogicException
      */
-    public function testAddFallbackCatalogueWithCircularReference()
+    public function testAddFallbackCatalogueWithParentCircularReference()
     {
         $main = new MessageCatalogue('en_US');
         $fallback = new MessageCatalogue('fr_FR');
@@ -136,6 +136,20 @@ public function testAddFallbackCatalogueWithCircularReference()
         $main->addFallbackCatalogue($fallback);
     }
 
+    /**
+     * @expectedException \LogicException
+     */
+    public function testAddFallbackCatalogueWithFallbackCircularReference()
+    {
+        $fr = new MessageCatalogue('fr');
+        $en = new MessageCatalogue('en');
+        $es = new MessageCatalogue('es');
+
+        $fr->addFallbackCatalogue($en);
+        $es->addFallbackCatalogue($en);
+        $en->addFallbackCatalogue($fr);
+    }
+
     /**
      * @expectedException \LogicException
      */
@@ -178,10 +192,10 @@ public function testMetadataSetGetDelete()
         $this->assertEquals(array(), $catalogue->getMetadata('key2', 'messages'), 'Metadata key2 is array');
 
         $catalogue->deleteMetadata('key2', 'messages');
-        $this->assertEquals(null, $catalogue->getMetadata('key2', 'messages'), 'Metadata key2 should is deleted.');
+        $this->assertNull($catalogue->getMetadata('key2', 'messages'), 'Metadata key2 should is deleted.');
 
         $catalogue->deleteMetadata('key2', 'domain');
-        $this->assertEquals(null, $catalogue->getMetadata('key2', 'domain'), 'Metadata key2 should is deleted.');
+        $this->assertNull($catalogue->getMetadata('key2', 'domain'), 'Metadata key2 should is deleted.');
     }
 
     public function testMetadataMerge()

Translator.php

@@ -449,8 +449,9 @@ private function loadFallbackCatalogues($locale)
                 $this->doLoadCatalogue($fallback);
             }
 
-            $current->addFallbackCatalogue($this->catalogues[$fallback]);
-            $current = $this->catalogues[$fallback];
+            $fallbackCatalogue = new MessageCatalogue($fallback, $this->catalogues[$fallback]->all());
+            $current->addFallbackCatalogue($fallbackCatalogue);
+            $current = $fallbackCatalogue;
         }
     }