Merge branch '3.4' into 4.2

* 3.4:
  [DI] Removes number of elements information in debug mode
  Update PR template for 4.3
  [Intl] Add FallbackTrait for data generation
  [Console] Commands with an alias should not be recognized as ambiguous
  clarify the possible class/interface of the cache

Author: nicolas-grekas

Application.php

@@ -610,6 +610,15 @@ public function find($name)
         $this->init();
 
         $aliases = [];
+
+        foreach ($this->commands as $command) {
+            foreach ($command->getAliases() as $alias) {
+                if (!$this->has($alias)) {
+                    $this->commands[$alias] = $command;
+                }
+            }
+        }
+
         $allCommands = $this->commandLoader ? array_merge($this->commandLoader->getNames(), array_keys($this->commands)) : array_keys($this->commands);
         $expr = preg_replace_callback('{([^:]+|)}', function ($matches) { return preg_quote($matches[1]).'[^:]*'; }, $name);
         $commands = preg_grep('{^'.$expr.'}', $allCommands);

Tests/ApplicationTest.php

@@ -73,8 +73,8 @@ public static function setUpBeforeClass()
         require_once self::$fixturesPath.'/FooSubnamespaced1Command.php';
         require_once self::$fixturesPath.'/FooSubnamespaced2Command.php';
         require_once self::$fixturesPath.'/FooWithoutAliasCommand.php';
-        require_once self::$fixturesPath.'/TestTiti.php';
-        require_once self::$fixturesPath.'/TestToto.php';
+        require_once self::$fixturesPath.'/TestAmbiguousCommandRegistering.php';
+        require_once self::$fixturesPath.'/TestAmbiguousCommandRegistering2.php';
     }
 
     protected function normalizeLineBreaks($text)
@@ -165,6 +165,28 @@ public function testRegister()
         $this->assertEquals('foo', $command->getName(), '->register() registers a new command');
     }
 
+    public function testRegisterAmbiguous()
+    {
+        $code = function (InputInterface $input, OutputInterface $output) {
+            $output->writeln('It works!');
+        };
+
+        $application = new Application();
+        $application->setAutoExit(false);
+        $application
+            ->register('test-foo')
+            ->setAliases(['test'])
+            ->setCode($code);
+
+        $application
+            ->register('test-bar')
+            ->setCode($code);
+
+        $tester = new ApplicationTester($application);
+        $tester->run(['test']);
+        $this->assertContains('It works!', $tester->getDisplay(true));
+    }
+
     public function testAdd()
     {
         $application = new Application();
@@ -304,9 +326,9 @@ public function testFindAmbiguousNamespace()
     public function testFindNonAmbiguous()
     {
         $application = new Application();
-        $application->add(new \TestTiti());
-        $application->add(new \TestToto());
-        $this->assertEquals('test-toto', $application->find('test')->getName());
+        $application->add(new \TestAmbiguousCommandRegistering());
+        $application->add(new \TestAmbiguousCommandRegistering2());
+        $this->assertEquals('test-ambiguous', $application->find('test')->getName());
     }
 
     /**

Tests/Fixtures/TestToto.php renamed to Tests/Fixtures/TestAmbiguousCommandRegistering.php

@@ -4,19 +4,19 @@
 use Symfony\Component\Console\Input\InputInterface;
 use Symfony\Component\Console\Output\OutputInterface;
 
-class TestToto extends Command
+class TestAmbiguousCommandRegistering extends Command
 {
     protected function configure()
     {
         $this
-            ->setName('test-toto')
-            ->setDescription('The test-toto command')
+            ->setName('test-ambiguous')
+            ->setDescription('The test-ambiguous command')
             ->setAliases(['test'])
         ;
     }
 
     protected function execute(InputInterface $input, OutputInterface $output)
     {
-        $output->write('test-toto');
+        $output->write('test-ambiguous');
     }
 }

Tests/Fixtures/TestTiti.php renamed to Tests/Fixtures/TestAmbiguousCommandRegistering2.php

@@ -4,18 +4,18 @@
 use Symfony\Component\Console\Input\InputInterface;
 use Symfony\Component\Console\Output\OutputInterface;
 
-class TestTiti extends Command
+class TestAmbiguousCommandRegistering2 extends Command
 {
     protected function configure()
     {
         $this
-            ->setName('test-titi')
-            ->setDescription('The test:titi command')
+            ->setName('test-ambiguous2')
+            ->setDescription('The test-ambiguous2 command')
         ;
     }
 
     protected function execute(InputInterface $input, OutputInterface $output)
     {
-        $output->write('test-titi');
+        $output->write('test-ambiguous2');
     }
 }