diff --git a/src/Symfony/Bundle/FrameworkBundle/Command/ContainerDebugCommand.php b/src/Symfony/Bundle/FrameworkBundle/Command/ContainerDebugCommand.php
index fcdd4810d8..b86df408fd 100644
--- a/src/Symfony/Bundle/FrameworkBundle/Command/ContainerDebugCommand.php
+++ b/src/Symfony/Bundle/FrameworkBundle/Command/ContainerDebugCommand.php
@@ -220,9 +220,8 @@ EOF
     {
         $serviceIds = $builder->getServiceIds();
         $foundServiceIds = array();
-        $name = strtolower($name);
         foreach ($serviceIds as $serviceId) {
-            if (false === strpos($serviceId, $name)) {
+            if (false === stripos($serviceId, $name)) {
                 continue;
             }
             $foundServiceIds[] = $serviceId;
diff --git a/src/Symfony/Bundle/TwigBundle/Resources/views/exception.css.twig b/src/Symfony/Bundle/TwigBundle/Resources/views/exception.css.twig
index 87a60d4197..f0ca2f5b04 100644
--- a/src/Symfony/Bundle/TwigBundle/Resources/views/exception.css.twig
+++ b/src/Symfony/Bundle/TwigBundle/Resources/views/exception.css.twig
@@ -22,7 +22,7 @@ table th { background-color: #E0E0E0; font-weight: bold; text-align: left; }
 .hidden { display: none; }
 .nowrap { white-space: nowrap; }
 .newline { display: block; }
-.break-long-words { -ms-word-break: break-all; word-break: break-all; word-break: break-word; -webkit-hyphens: auto; -moz-hyphens: auto; hyphens: auto; }
+.break-long-words { word-wrap: break-word; overflow-wrap: break-word; -webkit-hyphens: auto; -moz-hyphens: auto; hyphens: auto; min-width: 0; }
 .text-small { font-size: 12px !important; }
 .text-muted { color: #999; }
 .text-bold { font-weight: bold; }
diff --git a/src/Symfony/Bundle/WebProfilerBundle/Resources/views/Profiler/toolbar.css.twig b/src/Symfony/Bundle/WebProfilerBundle/Resources/views/Profiler/toolbar.css.twig
index 670dd47e1c..075a39f71f 100644
--- a/src/Symfony/Bundle/WebProfilerBundle/Resources/views/Profiler/toolbar.css.twig
+++ b/src/Symfony/Bundle/WebProfilerBundle/Resources/views/Profiler/toolbar.css.twig
@@ -40,6 +40,7 @@
     -moz-box-sizing: content-box;
     box-sizing: content-box;
     vertical-align: baseline;
+    letter-spacing: normal;
 }
 
 .sf-toolbarreset {
diff --git a/src/Symfony/Component/DependencyInjection/Compiler/CheckDefinitionValidityPass.php b/src/Symfony/Component/DependencyInjection/Compiler/CheckDefinitionValidityPass.php
index 0a10a16fb1..d7d44d90ce 100644
--- a/src/Symfony/Component/DependencyInjection/Compiler/CheckDefinitionValidityPass.php
+++ b/src/Symfony/Component/DependencyInjection/Compiler/CheckDefinitionValidityPass.php
@@ -77,16 +77,20 @@ class CheckDefinitionValidityPass implements CompilerPassInterface
                 }
             }
 
-            $resolvedId = $container->resolveEnvPlaceholders($id, null, $usedEnvs);
-            if (null !== $usedEnvs) {
-                throw new EnvParameterException(array($resolvedId), null, 'A service name ("%s") cannot contain dynamic values.');
+            if ($definition->isPublic() && !$definition->isPrivate()) {
+                $resolvedId = $container->resolveEnvPlaceholders($id, null, $usedEnvs);
+                if (null !== $usedEnvs) {
+                    throw new EnvParameterException(array($resolvedId), null, 'A service name ("%s") cannot contain dynamic values.');
+                }
             }
         }
 
         foreach ($container->getAliases() as $id => $alias) {
-            $resolvedId = $container->resolveEnvPlaceholders($id, null, $usedEnvs);
-            if (null !== $usedEnvs) {
-                throw new EnvParameterException(array($resolvedId), null, 'An alias name ("%s") cannot contain dynamic values.');
+            if ($alias->isPublic() && !$alias->isPrivate()) {
+                $resolvedId = $container->resolveEnvPlaceholders($id, null, $usedEnvs);
+                if (null !== $usedEnvs) {
+                    throw new EnvParameterException(array($resolvedId), null, 'An alias name ("%s") cannot contain dynamic values.');
+                }
             }
         }
     }
diff --git a/src/Symfony/Component/DependencyInjection/Compiler/ResolveEnvPlaceholdersPass.php b/src/Symfony/Component/DependencyInjection/Compiler/ResolveEnvPlaceholdersPass.php
index 8e44008317..f42107c6f7 100644
--- a/src/Symfony/Component/DependencyInjection/Compiler/ResolveEnvPlaceholdersPass.php
+++ b/src/Symfony/Component/DependencyInjection/Compiler/ResolveEnvPlaceholdersPass.php
@@ -35,7 +35,7 @@ class ResolveEnvPlaceholdersPass extends AbstractRecursivePass
 
         $value = parent::processValue($value, $isRoot);
 
-        if ($value && is_array($value)) {
+        if ($value && is_array($value) && !$isRoot) {
             $value = array_combine($this->container->resolveEnvPlaceholders(array_keys($value), true), $value);
         }
 
diff --git a/src/Symfony/Component/DependencyInjection/ContainerBuilder.php b/src/Symfony/Component/DependencyInjection/ContainerBuilder.php
index 58fa46940f..b7381de7e5 100644
--- a/src/Symfony/Component/DependencyInjection/ContainerBuilder.php
+++ b/src/Symfony/Component/DependencyInjection/ContainerBuilder.php
@@ -1341,7 +1341,7 @@ class ContainerBuilder extends Container implements TaggedContainerInterface
      *                                    true to resolve to the actual values of the referenced env vars
      * @param array            &$usedEnvs Env vars found while resolving are added to this array
      *
-     * @return string The string with env parameters resolved
+     * @return mixed The value with env parameters resolved if a string or an array is passed
      */
     public function resolveEnvPlaceholders($value, $format = null, array &$usedEnvs = null)
     {
diff --git a/src/Symfony/Component/DependencyInjection/Dumper/PhpDumper.php b/src/Symfony/Component/DependencyInjection/Dumper/PhpDumper.php
index fc58513ede..0a33fb3083 100644
--- a/src/Symfony/Component/DependencyInjection/Dumper/PhpDumper.php
+++ b/src/Symfony/Component/DependencyInjection/Dumper/PhpDumper.php
@@ -192,7 +192,7 @@ EOF;
                 sort($ids);
                 $c = "<?php\n\nreturn array(\n";
                 foreach ($ids as $id) {
-                    $c .= '    '.$this->export($id)." => true,\n";
+                    $c .= '    '.$this->doExport($id)." => true,\n";
                 }
                 $files['removed-ids.php'] = $c .= ");\n";
             }
@@ -894,6 +894,7 @@ EOF;
     private function addNewInstance(Definition $definition, $return, $instantiation, $id)
     {
         $class = $this->dumpValue($definition->getClass());
+        $return = '        '.$return.$instantiation;
 
         $arguments = array();
         foreach ($definition->getArguments() as $value) {
@@ -909,7 +910,7 @@ EOF;
 
                 if ($callable[0] instanceof Reference
                     || ($callable[0] instanceof Definition && $this->definitionVariables->contains($callable[0]))) {
-                    return sprintf("        $return{$instantiation}%s->%s(%s);\n", $this->dumpValue($callable[0]), $callable[1], $arguments ? implode(', ', $arguments) : '');
+                    return $return.sprintf("%s->%s(%s);\n", $this->dumpValue($callable[0]), $callable[1], $arguments ? implode(', ', $arguments) : '');
                 }
 
                 $class = $this->dumpValue($callable[0]);
@@ -919,24 +920,24 @@ EOF;
                         throw new RuntimeException(sprintf('Cannot dump definition: The "%s" service is defined to be created by a factory but is missing the service reference, did you forget to define the factory service id or class?', $id));
                     }
 
-                    return sprintf("        $return{$instantiation}%s::%s(%s);\n", $this->dumpLiteralClass($class), $callable[1], $arguments ? implode(', ', $arguments) : '');
+                    return $return.sprintf("%s::%s(%s);\n", $this->dumpLiteralClass($class), $callable[1], $arguments ? implode(', ', $arguments) : '');
                 }
 
                 if (0 === strpos($class, 'new ')) {
-                    return sprintf("        $return{$instantiation}(%s)->%s(%s);\n", $this->dumpValue($callable[0]), $callable[1], $arguments ? implode(', ', $arguments) : '');
+                    return $return.sprintf("(%s)->%s(%s);\n", $this->dumpValue($callable[0]), $callable[1], $arguments ? implode(', ', $arguments) : '');
                 }
 
-                return sprintf("        $return{$instantiation}call_user_func(array(%s, '%s')%s);\n", $this->dumpValue($callable[0]), $callable[1], $arguments ? ', '.implode(', ', $arguments) : '');
+                return $return.sprintf("call_user_func(array(%s, '%s')%s);\n", $this->dumpValue($callable[0]), $callable[1], $arguments ? ', '.implode(', ', $arguments) : '');
             }
 
-            return sprintf("        $return{$instantiation}%s(%s);\n", $this->dumpLiteralClass($this->dumpValue($callable)), $arguments ? implode(', ', $arguments) : '');
+            return $return.sprintf("%s(%s);\n", $this->dumpLiteralClass($this->dumpValue($callable)), $arguments ? implode(', ', $arguments) : '');
         }
 
         if (false !== strpos($class, '$')) {
-            return sprintf("        \$class = %s;\n\n        $return{$instantiation}new \$class(%s);\n", $class, implode(', ', $arguments));
+            return sprintf("        \$class = %s;\n\n%snew \$class(%s);\n", $class, $return, implode(', ', $arguments));
         }
 
-        return sprintf("        $return{$instantiation}new %s(%s);\n", $this->dumpLiteralClass($class), implode(', ', $arguments));
+        return $return.sprintf("new %s(%s);\n", $this->dumpLiteralClass($class), implode(', ', $arguments));
     }
 
     /**
@@ -1087,7 +1088,7 @@ EOF;
         ksort($normalizedIds);
         foreach ($normalizedIds as $id => $normalizedId) {
             if ($this->container->has($normalizedId)) {
-                $code .= '            '.$this->export($id).' => '.$this->export($normalizedId).",\n";
+                $code .= '            '.$this->doExport($id).' => '.$this->doExport($normalizedId).",\n";
             }
         }
 
@@ -1106,7 +1107,7 @@ EOF;
         ksort($definitions);
         foreach ($definitions as $id => $definition) {
             if ($definition->isSynthetic() && 'service_container' !== $id) {
-                $code .= '            '.$this->export($id)." => true,\n";
+                $code .= '            '.$this->doExport($id)." => true,\n";
             }
         }
 
@@ -1130,7 +1131,7 @@ EOF;
             $ids = array_keys($ids);
             sort($ids);
             foreach ($ids as $id) {
-                $code .= '            '.$this->export($id)." => true,\n";
+                $code .= '            '.$this->doExport($id)." => true,\n";
             }
 
             $code = "array(\n{$code}        )";
@@ -1158,7 +1159,7 @@ EOF;
         ksort($definitions);
         foreach ($definitions as $id => $definition) {
             if (!$definition->isSynthetic() && (!$this->asFiles || !$definition->isShared() || $this->isHotPath($definition))) {
-                $code .= '            '.$this->export($id).' => '.$this->export($this->generateMethodName($id)).",\n";
+                $code .= '            '.$this->doExport($id).' => '.$this->doExport($this->generateMethodName($id)).",\n";
             }
         }
 
@@ -1177,7 +1178,7 @@ EOF;
         ksort($definitions);
         foreach ($definitions as $id => $definition) {
             if (!$definition->isSynthetic() && $definition->isShared() && !$this->isHotPath($definition)) {
-                $code .= sprintf("            %s => __DIR__.'/%s.php',\n", $this->export($id), $this->generateMethodName($id));
+                $code .= sprintf("            %s => __DIR__.'/%s.php',\n", $this->doExport($id), $this->generateMethodName($id));
             }
         }
 
@@ -1197,7 +1198,7 @@ EOF;
         ksort($aliases);
         foreach ($aliases as $id => $alias) {
             if ($alias->isPrivate()) {
-                $code .= '            '.$this->export($id)." => true,\n";
+                $code .= '            '.$this->doExport($id)." => true,\n";
             }
         }
 
@@ -1205,7 +1206,7 @@ EOF;
         ksort($definitions);
         foreach ($definitions as $id => $definition) {
             if (!$definition->isPublic()) {
-                $code .= '            '.$this->export($id)." => true,\n";
+                $code .= '            '.$this->doExport($id)." => true,\n";
             }
         }
 
@@ -1238,7 +1239,7 @@ EOF;
             while (isset($aliases[$id])) {
                 $id = (string) $aliases[$id];
             }
-            $code .= '            '.$this->export($alias).' => '.$this->export($id).",\n";
+            $code .= '            '.$this->doExport($alias).' => '.$this->doExport($id).",\n";
         }
 
         return $code."        );\n";
@@ -2037,9 +2038,9 @@ EOF;
     private function export($value)
     {
         if (null !== $this->targetDirRegex && is_string($value) && preg_match($this->targetDirRegex, $value, $matches, PREG_OFFSET_CAPTURE)) {
-            $prefix = $matches[0][1] ? $this->doExport(substr($value, 0, $matches[0][1])).'.' : '';
+            $prefix = $matches[0][1] ? $this->doExport(substr($value, 0, $matches[0][1]), true).'.' : '';
             $suffix = $matches[0][1] + strlen($matches[0][0]);
-            $suffix = isset($value[$suffix]) ? '.'.$this->doExport(substr($value, $suffix)) : '';
+            $suffix = isset($value[$suffix]) ? '.'.$this->doExport(substr($value, $suffix), true) : '';
             $dirname = '__DIR__';
             $offset = 1 + $this->targetDirMaxMatches - count($matches);
 
@@ -2054,10 +2055,10 @@ EOF;
             return $dirname;
         }
 
-        return $this->doExport($value);
+        return $this->doExport($value, true);
     }
 
-    private function doExport($value)
+    private function doExport($value, $resolveEnv = false)
     {
         if (is_string($value) && false !== strpos($value, "\n")) {
             $cleanParts = explode("\n", $value);
@@ -2067,7 +2068,7 @@ EOF;
             $export = var_export($value, true);
         }
 
-        if ("'" === $export[0] && $export !== $resolvedExport = $this->container->resolveEnvPlaceholders($export, "'.\$this->getEnv('string:%s').'")) {
+        if ($resolveEnv && "'" === $export[0] && $export !== $resolvedExport = $this->container->resolveEnvPlaceholders($export, "'.\$this->getEnv('string:%s').'")) {
             $export = $resolvedExport;
             if (".''" === substr($export, -3)) {
                 $export = substr($export, 0, -3);
diff --git a/src/Symfony/Component/DependencyInjection/Tests/Compiler/CheckDefinitionValidityPassTest.php b/src/Symfony/Component/DependencyInjection/Tests/Compiler/CheckDefinitionValidityPassTest.php
index 473d5667d4..f698ed02dc 100644
--- a/src/Symfony/Component/DependencyInjection/Tests/Compiler/CheckDefinitionValidityPassTest.php
+++ b/src/Symfony/Component/DependencyInjection/Tests/Compiler/CheckDefinitionValidityPassTest.php
@@ -79,11 +79,11 @@ class CheckDefinitionValidityPassTest extends TestCase
     /**
      * @expectedException \Symfony\Component\DependencyInjection\Exception\EnvParameterException
      */
-    public function testDynamicServiceName()
+    public function testDynamicPublicServiceName()
     {
         $container = new ContainerBuilder();
         $env = $container->getParameterBag()->get('env(BAR)');
-        $container->register("foo.$env", 'class');
+        $container->register("foo.$env", 'class')->setPublic(true);
 
         $this->process($container);
     }
@@ -91,15 +91,27 @@ class CheckDefinitionValidityPassTest extends TestCase
     /**
      * @expectedException \Symfony\Component\DependencyInjection\Exception\EnvParameterException
      */
-    public function testDynamicAliasName()
+    public function testDynamicPublicAliasName()
     {
         $container = new ContainerBuilder();
         $env = $container->getParameterBag()->get('env(BAR)');
-        $container->setAlias("foo.$env", 'class');
+        $container->setAlias("foo.$env", 'class')->setPublic(true);
 
         $this->process($container);
     }
 
+    public function testDynamicPrivateName()
+    {
+        $container = new ContainerBuilder();
+        $env = $container->getParameterBag()->get('env(BAR)');
+        $container->register("foo.$env", 'class');
+        $container->setAlias("bar.$env", 'class');
+
+        $this->process($container);
+
+        $this->addToAssertionCount(1);
+    }
+
     protected function process(ContainerBuilder $container)
     {
         $pass = new CheckDefinitionValidityPass();
diff --git a/src/Symfony/Component/DependencyInjection/Tests/ContainerBuilderTest.php b/src/Symfony/Component/DependencyInjection/Tests/ContainerBuilderTest.php
index c1014247e9..0685b9238f 100644
--- a/src/Symfony/Component/DependencyInjection/Tests/ContainerBuilderTest.php
+++ b/src/Symfony/Component/DependencyInjection/Tests/ContainerBuilderTest.php
@@ -716,6 +716,29 @@ class ContainerBuilderTest extends TestCase
         $this->assertNull($container->get('foo')->fake);
     }
 
+    public function testEnvInId()
+    {
+        $container = include __DIR__.'/Fixtures/containers/container_env_in_id.php';
+        $container->compile(true);
+
+        $expected = array(
+            'service_container',
+            'foo',
+            'bar',
+            'bar_%env(BAR)%',
+        );
+        $this->assertSame($expected, array_keys($container->getDefinitions()));
+
+        $expected = array(
+            PsrContainerInterface::class => true,
+            ContainerInterface::class => true,
+            'baz_%env(BAR)%' => true,
+        );
+        $this->assertSame($expected, $container->getRemovedIds());
+
+        $this->assertSame(array('baz_bar'), array_keys($container->getDefinition('foo')->getArgument(1)));
+    }
+
     /**
      * @expectedException \Symfony\Component\DependencyInjection\Exception\ParameterCircularReferenceException
      * @expectedExceptionMessage Circular reference detected for parameter "env(resolve:DUMMY_ENV_VAR)" ("env(resolve:DUMMY_ENV_VAR)" > "env(resolve:DUMMY_ENV_VAR)").
diff --git a/src/Symfony/Component/DependencyInjection/Tests/Dumper/PhpDumperTest.php b/src/Symfony/Component/DependencyInjection/Tests/Dumper/PhpDumperTest.php
index e8e4a5fe80..4e8da769f4 100644
--- a/src/Symfony/Component/DependencyInjection/Tests/Dumper/PhpDumperTest.php
+++ b/src/Symfony/Component/DependencyInjection/Tests/Dumper/PhpDumperTest.php
@@ -326,6 +326,15 @@ class PhpDumperTest extends TestCase
         $this->assertStringEqualsFile(self::$fixturesPath.'/php/services24.php', $dumper->dump());
     }
 
+    public function testEnvInId()
+    {
+        $container = include self::$fixturesPath.'/containers/container_env_in_id.php';
+        $container->compile();
+        $dumper = new PhpDumper($container);
+
+        $this->assertStringEqualsFile(self::$fixturesPath.'/php/services_env_in_id.php', $dumper->dump());
+    }
+
     public function testEnvParameter()
     {
         $rand = mt_rand();
diff --git a/src/Symfony/Component/DependencyInjection/Tests/Fixtures/containers/container_env_in_id.php b/src/Symfony/Component/DependencyInjection/Tests/Fixtures/containers/container_env_in_id.php
new file mode 100644
index 0000000000..4699f41011
--- /dev/null
+++ b/src/Symfony/Component/DependencyInjection/Tests/Fixtures/containers/container_env_in_id.php
@@ -0,0 +1,22 @@
+<?php
+
+use Symfony\Component\DependencyInjection\ContainerBuilder;
+use Symfony\Component\DependencyInjection\Definition;
+use Symfony\Component\DependencyInjection\Dumper\PhpDumper;
+use Symfony\Component\DependencyInjection\Reference;
+
+$container = new ContainerBuilder();
+
+$container->setParameter('env(BAR)', 'bar');
+
+$container->register('foo', 'stdClass')->setPublic(true)
+   ->addArgument(new Reference('bar_%env(BAR)%'))
+   ->addArgument(array('baz_%env(BAR)%' => new Reference('baz_%env(BAR)%')));
+
+$container->register('bar', 'stdClass')->setPublic(true)
+   ->addArgument(new Reference('bar_%env(BAR)%'));
+
+$container->register('bar_%env(BAR)%', 'stdClass')->setPublic(false);
+$container->register('baz_%env(BAR)%', 'stdClass')->setPublic(false);
+
+return $container;
diff --git a/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services_env_in_id.php b/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services_env_in_id.php
new file mode 100644
index 0000000000..e122069a40
--- /dev/null
+++ b/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services_env_in_id.php
@@ -0,0 +1,185 @@
+<?php
+
+use Symfony\Component\DependencyInjection\Argument\RewindableGenerator;
+use Symfony\Component\DependencyInjection\ContainerInterface;
+use Symfony\Component\DependencyInjection\Container;
+use Symfony\Component\DependencyInjection\Exception\InvalidArgumentException;
+use Symfony\Component\DependencyInjection\Exception\LogicException;
+use Symfony\Component\DependencyInjection\Exception\RuntimeException;
+use Symfony\Component\DependencyInjection\ParameterBag\FrozenParameterBag;
+
+/**
+ * This class has been auto-generated
+ * by the Symfony Dependency Injection Component.
+ *
+ * @final since Symfony 3.3
+ */
+class ProjectServiceContainer extends Container
+{
+    private $parameters;
+    private $targetDirs = array();
+
+    public function __construct()
+    {
+        $this->parameters = $this->getDefaultParameters();
+
+        $this->services = array();
+        $this->normalizedIds = array(
+            'bar_%env(bar)%' => 'bar_%env(BAR)%',
+        );
+        $this->methodMap = array(
+            'bar' => 'getBarService',
+            'bar_%env(BAR)%' => 'getBarenvBARService',
+            'foo' => 'getFooService',
+        );
+        $this->privates = array(
+            'bar_%env(BAR)%' => true,
+        );
+
+        $this->aliases = array();
+    }
+
+    public function getRemovedIds()
+    {
+        return array(
+            'Psr\\Container\\ContainerInterface' => true,
+            'Symfony\\Component\\DependencyInjection\\ContainerInterface' => true,
+            'baz_%env(BAR)%' => true,
+        );
+    }
+
+    public function compile()
+    {
+        throw new LogicException('You cannot compile a dumped container that was already compiled.');
+    }
+
+    public function isCompiled()
+    {
+        return true;
+    }
+
+    public function isFrozen()
+    {
+        @trigger_error(sprintf('The %s() method is deprecated since version 3.3 and will be removed in 4.0. Use the isCompiled() method instead.', __METHOD__), E_USER_DEPRECATED);
+
+        return true;
+    }
+
+    /**
+     * Gets the public 'bar' shared service.
+     *
+     * @return \stdClass
+     */
+    protected function getBarService()
+    {
+        return $this->services['bar'] = new \stdClass(${($_ = isset($this->services['bar_%env(BAR)%']) ? $this->services['bar_%env(BAR)%'] : $this->services['bar_%env(BAR)%'] = new \stdClass()) && false ?: '_'});
+    }
+
+    /**
+     * Gets the public 'foo' shared service.
+     *
+     * @return \stdClass
+     */
+    protected function getFooService()
+    {
+        return $this->services['foo'] = new \stdClass(${($_ = isset($this->services['bar_%env(BAR)%']) ? $this->services['bar_%env(BAR)%'] : $this->services['bar_%env(BAR)%'] = new \stdClass()) && false ?: '_'}, array('baz_'.$this->getEnv('string:BAR') => new \stdClass()));
+    }
+
+    /**
+     * Gets the private 'bar_%env(BAR)%' shared service.
+     *
+     * @return \stdClass
+     */
+    protected function getBarenvBARService()
+    {
+        return $this->services['bar_%env(BAR)%'] = new \stdClass();
+    }
+
+    public function getParameter($name)
+    {
+        if (!(isset($this->parameters[$name]) || isset($this->loadedDynamicParameters[$name]) || array_key_exists($name, $this->parameters))) {
+            $name = $this->normalizeParameterName($name);
+
+            if (!(isset($this->parameters[$name]) || isset($this->loadedDynamicParameters[$name]) || array_key_exists($name, $this->parameters))) {
+                throw new InvalidArgumentException(sprintf('The parameter "%s" must be defined.', $name));
+            }
+        }
+        if (isset($this->loadedDynamicParameters[$name])) {
+            return $this->loadedDynamicParameters[$name] ? $this->dynamicParameters[$name] : $this->getDynamicParameter($name);
+        }
+
+        return $this->parameters[$name];
+    }
+
+    public function hasParameter($name)
+    {
+        $name = $this->normalizeParameterName($name);
+
+        return isset($this->parameters[$name]) || isset($this->loadedDynamicParameters[$name]) || array_key_exists($name, $this->parameters);
+    }
+
+    public function setParameter($name, $value)
+    {
+        throw new LogicException('Impossible to call set() on a frozen ParameterBag.');
+    }
+
+    public function getParameterBag()
+    {
+        if (null === $this->parameterBag) {
+            $parameters = $this->parameters;
+            foreach ($this->loadedDynamicParameters as $name => $loaded) {
+                $parameters[$name] = $loaded ? $this->dynamicParameters[$name] : $this->getDynamicParameter($name);
+            }
+            $this->parameterBag = new FrozenParameterBag($parameters);
+        }
+
+        return $this->parameterBag;
+    }
+
+    private $loadedDynamicParameters = array();
+    private $dynamicParameters = array();
+
+    /**
+     * Computes a dynamic parameter.
+     *
+     * @param string The name of the dynamic parameter to load
+     *
+     * @return mixed The value of the dynamic parameter
+     *
+     * @throws InvalidArgumentException When the dynamic parameter does not exist
+     */
+    private function getDynamicParameter($name)
+    {
+        throw new InvalidArgumentException(sprintf('The dynamic parameter "%s" must be defined.', $name));
+    }
+
+    private $normalizedParameterNames = array(
+        'env(bar)' => 'env(BAR)',
+    );
+
+    private function normalizeParameterName($name)
+    {
+        if (isset($this->normalizedParameterNames[$normalizedName = strtolower($name)]) || isset($this->parameters[$normalizedName]) || array_key_exists($normalizedName, $this->parameters)) {
+            $normalizedName = isset($this->normalizedParameterNames[$normalizedName]) ? $this->normalizedParameterNames[$normalizedName] : $normalizedName;
+            if ((string) $name !== $normalizedName) {
+                @trigger_error(sprintf('Parameter names will be made case sensitive in Symfony 4.0. Using "%s" instead of "%s" is deprecated since version 3.4.', $name, $normalizedName), E_USER_DEPRECATED);
+            }
+        } else {
+            $normalizedName = $this->normalizedParameterNames[$normalizedName] = (string) $name;
+        }
+
+        return $normalizedName;
+    }
+
+    /**
+     * Gets the default parameters.
+     *
+     * @return array An array of the default parameters
+     */
+    protected function getDefaultParameters()
+    {
+        return array(
+            'env(BAR)' => 'bar',
+        );
+    }
+}
diff --git a/src/Symfony/Component/Routing/Loader/AnnotationDirectoryLoader.php b/src/Symfony/Component/Routing/Loader/AnnotationDirectoryLoader.php
index 616d01ef4c..4574a0201c 100644
--- a/src/Symfony/Component/Routing/Loader/AnnotationDirectoryLoader.php
+++ b/src/Symfony/Component/Routing/Loader/AnnotationDirectoryLoader.php
@@ -34,7 +34,9 @@ class AnnotationDirectoryLoader extends AnnotationFileLoader
      */
     public function load($path, $type = null)
     {
-        $dir = $this->locator->locate($path);
+        if (!is_dir($dir = $this->locator->locate($path))) {
+            return parent::supports($path, $type) ? parent::load($path, $type) : new RouteCollection();
+        }
 
         $collection = new RouteCollection();
         $collection->addResource(new DirectoryResource($dir, '/\.php$/'));
@@ -74,16 +76,18 @@ class AnnotationDirectoryLoader extends AnnotationFileLoader
      */
     public function supports($resource, $type = null)
     {
-        if (!is_string($resource)) {
+        if ('annotation' === $type) {
+            return true;
+        }
+
+        if ($type || !is_string($resource)) {
             return false;
         }
 
         try {
-            $path = $this->locator->locate($resource);
+            return is_dir($this->locator->locate($resource));
         } catch (\Exception $e) {
             return false;
         }
-
-        return is_dir($path) && (!$type || 'annotation' === $type);
     }
 }
diff --git a/src/Symfony/Component/Routing/Tests/Loader/AnnotationDirectoryLoaderTest.php b/src/Symfony/Component/Routing/Tests/Loader/AnnotationDirectoryLoaderTest.php
index 78cec4be2a..1e8ee39401 100644
--- a/src/Symfony/Component/Routing/Tests/Loader/AnnotationDirectoryLoaderTest.php
+++ b/src/Symfony/Component/Routing/Tests/Loader/AnnotationDirectoryLoaderTest.php
@@ -69,6 +69,24 @@ class AnnotationDirectoryLoaderTest extends AbstractAnnotationLoaderTest
         $this->assertFalse($this->loader->supports($fixturesDir, 'foo'), '->supports() checks the resource type if specified');
     }
 
+    public function testItSupportsAnyAnnotation()
+    {
+        $this->assertTrue($this->loader->supports(__DIR__.'/../Fixtures/even-with-not-existing-folder', 'annotation'));
+    }
+
+    public function testLoadFileIfLocatedResourceIsFile()
+    {
+        $this->reader->expects($this->exactly(1))->method('getClassAnnotation');
+
+        $this->reader
+            ->expects($this->any())
+            ->method('getMethodAnnotations')
+            ->will($this->returnValue(array()))
+        ;
+
+        $this->loader->load(__DIR__.'/../Fixtures/AnnotatedClasses/FooClass.php');
+    }
+
     private function expectAnnotationsToBeReadFrom(array $classes)
     {
         $this->reader->expects($this->exactly(count($classes)))