Merge branch '3.0'

* 3.0:
  [VarDumper] Fix tests on PHP 7
  [DomCrawler] Clarify the value returned by getPhpFiles()
  [DependencyInjection] Fix #16461 Let Container::set() replace existing aliases
  avoid (string) catchable fatal error for instances of __PHP_Incomplete_Class
  remove unnecessary retrieval and setting of data
  Update validators.fr.xlf
  avoid (string) catchable fatal error for __PHP_Incomplete_Class instances
  sendContent return as parent.
  [DomCrawler] Remove the overridden getHash() method to prevent problems when cloning the crawler
  [FrameworkBundle] Fix a typo
  Added more exceptions to singularify method
  Add width attribute on SVG
  [FrameworkBundle] Support autowiring for TranslationInterface
  [Validator] remove obsolete context and PropertyAccess code
  [WebProfiler] Fixed styles for search block and menu profiler for IE Edge

Author: nicolas-grekas

Container.php

@@ -169,6 +169,10 @@ public function set($id, $service)
             throw new InvalidArgumentException('You cannot set service "service_container".');
         }
 
+        if (isset($this->aliases[$id])) {
+            unset($this->aliases[$id]);
+        }
+
         $this->services[$id] = $service;
 
         if (null === $service) {

Tests/ContainerBuilderTest.php

@@ -231,6 +231,16 @@ public function testAddAliases()
         $this->assertTrue(isset($aliases['foobar']));
     }
 
+    public function testSetReplacesAlias()
+    {
+        $builder = new ContainerBuilder();
+        $builder->setAlias('alias', 'aliased');
+        $builder->set('aliased', new \stdClass());
+
+        $builder->set('alias', $foo = new \stdClass());
+        $this->assertSame($foo, $builder->get('alias'), '->set() replaces an existing alias');
+    }
+
     public function testAddGetCompilerPass()
     {
         $builder = new ContainerBuilder();

Tests/ContainerTest.php

@@ -142,6 +142,14 @@ public function testSetWithNullResetTheService()
         $this->assertFalse($sc->has('foo'), '->set() with null service resets the service');
     }
 
+    public function testSetReplacesAlias()
+    {
+        $c = new ProjectServiceContainer();
+
+        $c->set('alias', $foo = new \stdClass());
+        $this->assertSame($foo, $c->get('alias'), '->set() replaces an existing alias');
+    }
+
     public function testGet()
     {
         $sc = new ProjectServiceContainer();