Normalize enum value to ClassConstFetch

Fixes nikic#930

lib/PhpParser/BuilderHelpers.php

@@ -215,7 +215,7 @@ public static function normalizeType($type) {
      * Normalizes a value: Converts nulls, booleans, integers,
      * floats, strings and arrays into their respective nodes
      *
-     * @param Node\Expr|bool|null|int|float|string|array $value The value to normalize
+     * @param Node\Expr|bool|null|int|float|string|array|\UnitEnum $value The value to normalize
      *
      * @return Expr The normalized value
      */
@@ -269,6 +269,10 @@ public static function normalizeValue($value) : Expr {
             return new Expr\Array_($items);
         }
 
+        if ($value instanceof \UnitEnum) {
+            return new Expr\ClassConstFetch(new Name(\get_class($value)), $value->name);
+        }
+
         throw new \LogicException('Invalid value');
     }
 

test/PhpParser/BuilderHelpersPHP81Test.php

@@ -0,0 +1,18 @@
+<?php declare(strict_types=1);
+
+namespace PhpParser;
+
+use PhpParser\Node\Expr;
+use PhpParser\Node\Name;
+
+/**
+ * @requires php 8.1
+ */
+class BuilderHelpersPHP81Test extends \PHPUnit\Framework\TestCase
+{
+    public function testNormalizeValueEnum() {
+        include __DIR__ . '/../code/Suit.php';
+
+        $this->assertEquals(new Expr\ClassConstFetch(new Name(\Suit::class), 'Hearts'), BuilderHelpers::normalizeValue(\Suit::Hearts));
+    }
+}

test/code/Suit.php

@@ -0,0 +1,9 @@
+<?php
+
+enum Suit
+{
+    case Hearts;
+    case Diamonds;
+    case Clubs;
+    case Spades;
+}