Fix downgrade throw on ArrowFunction return

Author: samsonasik

rules-tests/DowngradePhp80/Rector/Expression/DowngradeThrowExprRector/Fixture/fn_return_throw.php.inc

@@ -0,0 +1,29 @@
+<?php
+
+namespace Rector\Tests\DowngradePhp80\Rector\Expression\DowngradeThrowExprRector\Fixture;
+
+class FnReturnThrow
+{
+    public function run()
+    {
+        $line = Callback::invokeSafe('fgets', [$f], fn($error) => throw new Nette\IOException(\sprintf("Unable to read file '%s'. %s", self::normalizePath($file), $error)));
+    }
+}
+
+?>
+-----
+<?php
+
+namespace Rector\Tests\DowngradePhp80\Rector\Expression\DowngradeThrowExprRector\Fixture;
+
+class FnReturnThrow
+{
+    public function run()
+    {
+        $line = Callback::invokeSafe('fgets', [$f], function ($error) use ($file) {
+            throw new Nette\IOException(\sprintf("Unable to read file '%s'. %s", self::normalizePath($file), $error));
+        });
+    }
+}
+
+?>