minor #1331 Fix issue reported by PHPStan (javiereguiluz)

This PR was squashed before being merged into the main branch.

Discussion
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Fix issue reported by PHPStan

The original author of this fix is `@dkarlovi`, who kindly provided the solution in https://github.com/javiereguiluz/demo/pull/1/files

Thanks!

Commits
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8d6d59d Fix issue reported by PHPStan

Author: javiereguiluz

phpstan-baseline.neon

@@ -345,11 +345,6 @@ parameters:
 			count: 1
 			path: src/Twig/SourceCodeExtension.php
 
-		-
-			message: "#^Parameter \\#1 \\$array of function array_slice expects array, array\\<int, string\\>\\|false given\\.$#"
-			count: 1
-			path: src/Twig/SourceCodeExtension.php
-
 		-
 			message: "#^Parameter \\#1 \\$filename of function file expects string, string\\|false given\\.$#"
 			count: 1

src/Twig/SourceCodeExtension.php

@@ -65,7 +65,9 @@ private function getController(): ?array
 
         $method = $this->getCallableReflector($this->controller);
 
-        $classCode = file($method->getFileName());
+        if (false === $classCode = file($method->getFileName())) {
+            throw new \LogicException(sprintf('There was an error while trying to read the contents of the "%s" file.', $method->getFileName()));
+        }
 
         $startLine = $method->getStartLine() - 1;
         $endLine = $method->getEndLine();