fixed PHPStan errors

Author: dg

phpstan.neon

@@ -1,5 +1,5 @@
 parameters:
-	level: 7
+	level: 8
 
 	paths:
 		- src
@@ -17,14 +17,3 @@ parameters:
 			count: 1
 			path: src/RobotLoader/RobotLoader.php
 
-		-
-			message: '#^Unreachable statement \- code above always terminates\.$#'
-			identifier: deadCode.unreachable
-			count: 1
-			path: src/RobotLoader/RobotLoader.php
-
-		-
-			message: '#^Variable \$prevFile in isset\(\) always exists and is not nullable\.$#'
-			identifier: isset.variable
-			count: 2
-			path: src/RobotLoader/RobotLoader.php

src/RobotLoader/RobotLoader.php

@@ -97,18 +97,18 @@ public function tryLoad(string $type): void
 			return;
 		}
 
-		[$file, $mtime] = $this->classes[$type] ?? null;
+		[$file, $mtime] = $this->classes[$type] ?? [null, null];
 
 		if ($this->autoRebuild) {
 			if (!$this->refreshed) {
 				if (!$file || !is_file($file)) {
 					$this->refreshClasses();
-					[$file] = $this->classes[$type] ?? null;
+					[$file] = $this->classes[$type] ?? [null, null];
 					$this->needSave = true;
 
 				} elseif (filemtime($file) !== $mtime) {
 					$this->updateFile($file);
-					[$file] = $this->classes[$type] ?? null;
+					[$file] = $this->classes[$type] ?? [null, null];
 					$this->needSave = true;
 				}
 			}
@@ -285,11 +285,11 @@ private function updateFile(string $file): void
 		$foundClasses = is_file($file) ? $this->scanPhp($file) : [];
 
 		foreach ($foundClasses as $class) {
-			[$prevFile, $prevMtime] = $this->classes[$class] ?? null;
+			[$prevFile, $prevMtime] = $this->classes[$class] ?? [null, null];
 
 			if (isset($prevFile) && @filemtime($prevFile) !== $prevMtime) { // @ file may not exist
 				$this->updateFile($prevFile);
-				[$prevFile] = $this->classes[$class] ?? null;
+				[$prevFile] = $this->classes[$class] ?? [null, null];
 			}
 
 			if (isset($prevFile)) {
@@ -485,13 +485,13 @@ private function acquireLock(string $file, int $mode)
 	{
 		$handle = @fopen($file, 'w'); // @ is escalated to exception
 		if (!$handle) {
-			throw new \RuntimeException(sprintf("Unable to create file '%s'. %s", $file, error_get_last()['message']));
+			throw new \RuntimeException(sprintf("Unable to create file '%s'. %s", $file, error_get_last()['message'] ?? ''));
 		} elseif (!@flock($handle, $mode)) { // @ is escalated to exception
 			throw new \RuntimeException(sprintf(
 				"Unable to acquire %s lock on file '%s'. %s",
 				$mode & LOCK_EX ? 'exclusive' : 'shared',
 				$file,
-				error_get_last()['message'],
+				error_get_last()['message'] ?? '',
 			));
 		}