Do not hide errors for SkipLint process

Author: JakubOnderka

Diff for: bin/skip-linting.php

@@ -19,4 +19,3 @@
 
     echo $file . ';' . ($skip ? '1' : '0') . PHP_EOL;
 }
-

Diff for: src/ParallelLint.php

@@ -134,6 +134,10 @@ public function lint(array $files)
         if (!empty($waiting)) {
             $skipLintProcess->waitForFinish();
 
+            if ($skipLintProcess->getErrorOutput()) {
+                throw new \Exception("Error in skip-linting.php process\nError output: {$skipLintProcess->getErrorOutput()}");
+            }
+
             foreach ($waiting as $file => $process) {
                 $skipStatus = $skipLintProcess->isSkipped($file);
                 if ($skipStatus === null) {

Diff for: src/Process/SkipLintProcess.php

@@ -30,7 +30,7 @@ public function __construct(PhpExecutable $phpExecutable, array $filesToCheck)
 
         $script = str_replace('<?php', '', $script);
 
-        $parameters = array('-n', '-r ' . escapeshellarg($script));
+        $parameters = array('-d display_errors=stderr', '-n', '-r ' . escapeshellarg($script));
 
         parent::__construct($phpExecutable, $parameters, implode(PHP_EOL, $filesToCheck));
     }