Command/LintCommand.php

@@ -12,6 +12,8 @@
 namespace Symfony\Component\Yaml\Command;
 
 use Symfony\Component\Console\Command\Command;
+use Symfony\Component\Console\Exception\InvalidArgumentException;
+use Symfony\Component\Console\Exception\RuntimeException;
 use Symfony\Component\Console\Input\InputInterface;
 use Symfony\Component\Console\Input\InputOption;
 use Symfony\Component\Console\Output\OutputInterface;
@@ -86,14 +88,14 @@ protected function execute(InputInterface $input, OutputInterface $output)
 
         if (!$filename) {
             if (!$stdin = $this->getStdin()) {
-                throw new \RuntimeException('Please provide a filename or pipe file content to STDIN.');
+                throw new RuntimeException('Please provide a filename or pipe file content to STDIN.');
             }
 
             return $this->display($io, array($this->validate($stdin, $flags)));
         }
 
         if (!$this->isReadable($filename)) {
-            throw new \RuntimeException(sprintf('File or directory "%s" is not readable.', $filename));
+            throw new RuntimeException(sprintf('File or directory "%s" is not readable.', $filename));
         }
 
         $filesInfo = array();
@@ -133,7 +135,7 @@ private function display(SymfonyStyle $io, array $files)
             case 'json':
                 return $this->displayJson($io, $files);
             default:
-                throw new \InvalidArgumentException(sprintf('The format "%s" is not supported.', $this->format));
+                throw new InvalidArgumentException(sprintf('The format "%s" is not supported.', $this->format));
         }
     }
 

composer.json

@@ -16,7 +16,8 @@
         }
     ],
     "require": {
-        "php": "^7.1.3"
+        "php": "^7.1.3",
+        "symfony/polyfill-ctype": "~1.8"
     },
     "require-dev": {
         "symfony/console": "~3.4|~4.0"