feat: add a test

Author: xepozz

tests/lang/class_arrow_function_member.phpt

@@ -0,0 +1,25 @@
+--TEST--
+Arrow function as a class member
+--FILE--
+<?php
+
+class a{
+    public function test() {
+        return 111;
+    }
+    public fn test2() => 222;
+    private fn test3() => 333;
+    static fn test4() => 444;
+    protected static fn &test5() => 555;
+}
+
+$a = new a();
+
+var_dump($a->test());
+var_dump($a->test2());
+var_dump($a::test4());
+?>
+--EXPECT--
+int(111)
+int(222)
+int(444)