Fix build

Author: ondrejmirtes

src/NeverException.php

@@ -0,0 +1,20 @@
+<?php declare(strict_types = 1);
+
+namespace PHPStan;
+
+use Exception;
+use function get_debug_type;
+use function sprintf;
+
+final class NeverException extends Exception
+{
+
+	/**
+	 * @param never $value
+	 */
+	public function __construct($value)
+	{
+		parent::__construct(sprintf('Unknown value %s, expected never', get_debug_type($value)));
+	}
+
+}