Merge branch '4.0'

* 4.0:
  [HttpKernel] DebugHandlersListener should always replace the existing exception handler
  fix the Composer API being used
  [Security] Notify that symfony/expression-language is not installed if ExpressionLanguage and ExpressionLanguagePrivider are used
  [Debug] Always decorate existing exception handlers to deal with fatal errors
  Enableable ArrayNodeDefinition is disabled for empty configuration
  Fixing a bug where the dump() function depended on bundle ordering
  [Cache] Fix handling of apcu_fetch() edgy behavior
  Add nn (Norwegian Nynorsk) translation files, and improve existing file
  Problem in phar see mergerequest #25579
  [Form] Disallow transform dates beyond the year 9999
  Avoid button label translation when it's set to false
  Copied NO language files to the new NB locale.
  [Serializer] DateTimeNormalizer handling of null and empty values (returning null or empty instead of new object)
  Fix options resolver with array allowed types
  [Console] Improve phpdoc on StyleInterface::ask()
  [TwigBridge][WIP] Pass the form-check-inline in parent

Author: nicolas-grekas

Loader/XmlFileLoader.php

@@ -581,16 +581,20 @@ public function validateSchema(\DOMDocument $dom)
         $imports = '';
         foreach ($schemaLocations as $namespace => $location) {
             $parts = explode('/', $location);
+            $locationstart = 'file:///';
             if (0 === stripos($location, 'phar://')) {
                 $tmpfile = tempnam(sys_get_temp_dir(), 'symfony');
                 if ($tmpfile) {
                     copy($location, $tmpfile);
                     $tmpfiles[] = $tmpfile;
                     $parts = explode('/', str_replace('\\', '/', $tmpfile));
+                } else {
+                    array_shift($parts);
+                    $locationstart = 'phar:///';
                 }
             }
             $drive = '\\' === DIRECTORY_SEPARATOR ? array_shift($parts).'/' : '';
-            $location = 'file:///'.$drive.implode('/', array_map('rawurlencode', $parts));
+            $location = $locationstart.$drive.implode('/', array_map('rawurlencode', $parts));
 
             $imports .= sprintf('  <xsd:import namespace="%s" schemaLocation="%s" />'."\n", $namespace, $location);
         }