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-rw-r--r--libcxx/include/experimental/ratio18
1 files changed, 14 insertions, 4 deletions
diff --git a/libcxx/include/experimental/ratio b/libcxx/include/experimental/ratio
index 9c2bf2e4624..52c12004dba 100644
--- a/libcxx/include/experimental/ratio
+++ b/libcxx/include/experimental/ratio
@@ -1,11 +1,21 @@
// -*- C++ -*-
-//===------------------------------ ratio ---------------------------------===//
+//===----------------------------- ratio ----------------------------------===//
//
// The LLVM Compiler Infrastructure
//
-// This file is distributed under the University of Illinois Open Source
-// License. See LICENSE.TXT for details.
+// This file is dual licensed under the MIT and the University of Illinois Open
+// Source Licenses. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
+#ifndef _LIBCPP_EXPERIMENTAL_RATIO
+#define _LIBCPP_EXPERIMENTAL_RATIO
-#error "<experimental/ratio> has been removed. Use <ratio> instead."
+#include <__config>
+
+#ifdef _LIBCPP_WARNING
+_LIBCPP_WARNING("<experimental/ratio> has been removed. Use <ratio> instead.")
+#else
+# warning "<experimental/ratio> has been removed. Use <ratio> instead."
+#endif
+
+#endif // _LIBCPP_EXPERIMENTAL_RATIO
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