It's not possible to instantiate enum

Author: kukulich

src/Rules/Classes/InstantiationRule.php

@@ -137,6 +137,14 @@ private function checkClassName(string $class, bool $isName, Node $node, Scope $
 			$classReflection = $this->reflectionProvider->getClass($class);
 		}
 
+		if ($classReflection->isEnum() && $isName) {
+			return [
+				RuleErrorBuilder::message(
+					sprintf('Cannot instantiate enum %s.', $classReflection->getDisplayName())
+				)->build(),
+			];
+		}
+
 		if (!$isStatic && $classReflection->isInterface() && $isName) {
 			return [
 				RuleErrorBuilder::message(

tests/PHPStan/Rules/Classes/InstantiationRuleTest.php

@@ -361,4 +361,26 @@ public function testFirstClassCallable(): void
 		$this->analyse([__DIR__ . '/data/first-class-instantiation-callable.php'], []);
 	}
 
+	public function testEnumInstantiation(): void
+	{
+		if (PHP_VERSION_ID < 80100) {
+			$this->markTestSkipped('Test requires PHP 8.1.');
+		}
+
+		$this->analyse([__DIR__ . '/data/enum-instantiation.php'], [
+			[
+				'Cannot instantiate enum EnumInstantiation\Foo.',
+				9,
+			],
+			[
+				'Cannot instantiate enum EnumInstantiation\Foo.',
+				14,
+			],
+			[
+				'Cannot instantiate enum EnumInstantiation\Foo.',
+				21,
+			],
+		]);
+	}
+
 }

tests/PHPStan/Rules/Classes/data/enum-instantiation.php

@@ -0,0 +1,23 @@
+<?php // lint >= 8.1
+
+namespace EnumInstantiation;
+
+enum Foo
+{
+	public function createSelf()
+	{
+		return new self();
+	}
+
+	public function createStatic()
+	{
+		return new static();
+	}
+}
+
+class Boo
+{
+	public static function createFoo() {
+		return new Foo();
+	}
+}