Fix small PHPStan issues

Author: Bellangelo

phpstan-baseline.neon

@@ -576,19 +576,6 @@ parameters:
 			count: 1
 			path: src/Rules/Generics/TemplateTypeCheck.php
 
-		-
-			message: """
-				#^Call to deprecated method getValue\\(\\) of class PHPStan\\\\Reflection\\\\ClassConstantReflection\\:
-				Use getValueExpr\\(\\)$#
-			"""
-			count: 1
-			path: src/Rules/Keywords/RequireFileExistsRule.php
-
-		-
-			message: "#^Instanceof between PhpParser\\\\Node\\\\Name and PhpParser\\\\Node\\\\Name will always evaluate to true\\.$#"
-			count: 1
-			path: src/Rules/Keywords/RequireFileExistsRule.php
-
 		-
 			message: "#^Method PHPStan\\\\Rules\\\\Keywords\\\\RequireFileExistsRule\\:\\:processNode\\(\\) should return list\\<PHPStan\\\\Rules\\\\IdentifierRuleError\\> but returns array\\{PHPStan\\\\Rules\\\\RuleError\\}\\.$#"
 			count: 1

src/Rules/Keywords/RequireFileExistsRule.php

@@ -6,7 +6,9 @@
 use PhpParser\Node\Expr\Include_;
 use PHPStan\Analyser\Scope;
 use PHPStan\Rules\Rule;
+use PHPStan\Rules\RuleError;
 use PHPStan\Rules\RuleErrorBuilder;
+use PHPStan\ShouldNotHappenException;
 use function is_string;
 use function sprintf;
 
@@ -26,7 +28,7 @@ public function processNode(Node $node, Scope $scope): array
 			$filePath = $this->resolveFilePath($node, $scope);
 			if (is_string($filePath) && !is_file($filePath)) {
 				return [
-					$this->getErrorMessage($node, $filePath)->build()
+					$this->getErrorMessage($node, $filePath)
 				];
 			}
 		}
@@ -42,19 +44,20 @@ private function shouldProcessNode(Node $node): bool
 			);
 	}
 
-	private function getErrorMessage(Include_ $node, string $filePath): RuleErrorBuilder
+	private function getErrorMessage(Include_ $node, string $filePath): RuleError
 	{
 		$message = match ($node->type) {
 			Include_::TYPE_REQUIRE => 'Path in require() "%s" is not a file or it does not exist.',
 			Include_::TYPE_REQUIRE_ONCE => 'Path in require_once() "%s" is not a file or it does not exist.',
+			default => throw new ShouldNotHappenException('Rule should have already validated the node type.')
 		};
 
 		return RuleErrorBuilder::message(
 			sprintf(
 				$message,
 				$filePath,
 			),
-		);
+		)->build();
 	}
 
 	private function resolveFilePath(Include_ $node, Scope $scope): ?string