From 7a73c5f6bba386e0d82dd467e9dacceb10b851e3 Mon Sep 17 00:00:00 2001
From: Nikita Popov <nikita.ppv@gmail.com>
Date: Thu, 2 Feb 2017 00:23:11 +0100
Subject: [PATCH] Deprecate (unset)

Pecularily, there wasn't a single test for the (unset) cast...
---
 Zend/tests/unset_cast_deprecated.phpt | 14 ++++++++++++++
 Zend/zend_compile.c                   |  4 ++++
 2 files changed, 18 insertions(+)
 create mode 100644 Zend/tests/unset_cast_deprecated.phpt

diff --git a/Zend/tests/unset_cast_deprecated.phpt b/Zend/tests/unset_cast_deprecated.phpt
new file mode 100644
index 0000000000..6744c85f02
--- /dev/null
+++ b/Zend/tests/unset_cast_deprecated.phpt
@@ -0,0 +1,14 @@
+--TEST--
+The (unset) cast is deprecated
+--FILE--
+<?php
+
+$x = 1;
+var_dump((unset) $x);
+var_dump($x);
+
+?>
+--EXPECTF--
+Deprecated: The (unset) cast is deprecated in %s on line %d
+NULL
+int(1)
diff --git a/Zend/zend_compile.c b/Zend/zend_compile.c
index 9a904eefa8..84a3e6a021 100644
--- a/Zend/zend_compile.c
+++ b/Zend/zend_compile.c
@@ -6871,6 +6871,10 @@ void zend_compile_cast(znode *result, zend_ast *ast) /* {{{ */
 
 	opline = zend_emit_op_tmp(result, ZEND_CAST, &expr_node, NULL);
 	opline->extended_value = ast->attr;
+
+	if (ast->attr == IS_NULL) {
+		zend_error(E_DEPRECATED, "The (unset) cast is deprecated");
+	}
 }
 /* }}} */
 
-- 
2.40.0