Add identifier in rule

Author: Bellangelo

phpstan-baseline.neon

@@ -576,11 +576,6 @@ parameters:
 			count: 1
 			path: src/Rules/Generics/TemplateTypeCheck.php
 
-		-
-			message: "#^Method PHPStan\\\\Rules\\\\Keywords\\\\RequireFileExistsRule\\:\\:processNode\\(\\) should return list\\<PHPStan\\\\Rules\\\\IdentifierRuleError\\> but returns array\\{PHPStan\\\\Rules\\\\RuleError\\}\\.$#"
-			count: 1
-			path: src/Rules/Keywords/RequireFileExistsRule.php
-
 		-
 			message: "#^Function class_implements\\(\\) is a runtime reflection concept that might not work in PHPStan because it uses fully static reflection engine\\. Use objects retrieved from ReflectionProvider instead\\.$#"
 			count: 1

src/Rules/Keywords/RequireFileExistsRule.php

@@ -5,13 +5,14 @@
 use PhpParser\Node;
 use PhpParser\Node\Expr\Include_;
 use PHPStan\Analyser\Scope;
+use PHPStan\Rules\IdentifierRuleError;
 use PHPStan\Rules\Rule;
-use PHPStan\Rules\RuleError;
 use PHPStan\Rules\RuleErrorBuilder;
 use PHPStan\ShouldNotHappenException;
 use function is_file;
 use function is_string;
 use function sprintf;
+use function str_replace;
 
 /**
  * @implements Rule<Include_>
@@ -36,31 +37,36 @@ public function processNode(Node $node, Scope $scope): array
 		return [];
 	}
 
-	private function getErrorMessage(Include_ $node, string $filePath): RuleError
+	private function getErrorMessage(Include_ $node, string $filePath): IdentifierRuleError
 	{
+		$message = 'Path in %s() "%s" is not a file or it does not exist.';
+
 		switch ($node->type) {
 			case Include_::TYPE_REQUIRE:
-				$message = 'Path in require() "%s" is not a file or it does not exist.';
+				$type = 'require';
 				break;
 			case Include_::TYPE_REQUIRE_ONCE:
-				$message = 'Path in require_once() "%s" is not a file or it does not exist.';
+				$type = 'require_once';
 				break;
 			case Include_::TYPE_INCLUDE:
-				$message = 'Path in include() "%s" is not a file or it does not exist.';
+				$type = 'include';
 				break;
 			case Include_::TYPE_INCLUDE_ONCE:
-				$message = 'Path in include_once() "%s" is not a file or it does not exist.';
+				$type = 'include_once';
 				break;
 			default:
 				throw new ShouldNotHappenException('Rule should have already validated the node type.');
 		}
 
+		$identifier = sprintf('%s.fileNotFound', str_replace('_once', 'Once', $type));
+
 		return RuleErrorBuilder::message(
 			sprintf(
 				$message,
+				$type,
 				$filePath,
 			),
-		)->build();
+		)->nonIgnorable()->identifier($identifier)->build();
 	}
 
 	private function resolveFilePath(Include_ $node, Scope $scope): ?string