🐞 fix: Error cleanup, add test harness

vendor/nikic/php-parser/lib/PhpParser/Node/Expr/AssignOp.php

@@ -0,0 +1,29 @@
+<?php declare(strict_types=1);
+
+namespace PhpParser\Node\Expr;
+
+use PhpParser\Node\Expr;
+
+abstract class AssignOp extends Expr {
+    /** @var Expr Variable */
+    public Expr $var;
+    /** @var Expr Expression */
+    public Expr $expr;
+
+    /**
+     * Constructs a compound assignment operation node.
+     *
+     * @param Expr $var Variable
+     * @param Expr $expr Expression
+     * @param array<string, mixed> $attributes Additional attributes
+     */
+    public function __construct(Expr $var, Expr $expr, array $attributes = []) {
+        $this->attributes = $attributes;
+        $this->var = $var;
+        $this->expr = $expr;
+    }
+
+    public function getSubNodeNames(): array {
+        return ['var', 'expr'];
+    }
+}