From 53a420fba21cf1644972b34dcd811a43cdb8368d Mon Sep 17 00:00:00 2001
From: Dimitry Andric <dim@FreeBSD.org>
Date: Mon, 2 Jan 2017 19:18:58 +0000
Subject: Vendor import of libc++ trunk r290819:
 https://llvm.org/svn/llvm-project/libcxx/trunk@290819

---
 .../re.regex.construct/bad_backref.pass.cpp        | 44 ++++++++++++++++++++++
 1 file changed, 44 insertions(+)
 create mode 100644 test/std/re/re.regex/re.regex.construct/bad_backref.pass.cpp

(limited to 'test/std/re/re.regex/re.regex.construct/bad_backref.pass.cpp')

diff --git a/test/std/re/re.regex/re.regex.construct/bad_backref.pass.cpp b/test/std/re/re.regex/re.regex.construct/bad_backref.pass.cpp
new file mode 100644
index 000000000000..aca4d674d9f9
--- /dev/null
+++ b/test/std/re/re.regex/re.regex.construct/bad_backref.pass.cpp
@@ -0,0 +1,44 @@
+//===----------------------------------------------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is dual licensed under the MIT and the University of Illinois Open
+// Source Licenses. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+// UNSUPPORTED: libcpp-no-exceptions
+// <regex>
+
+// template <class charT, class traits = regex_traits<charT>> class basic_regex;
+
+// template <class ST, class SA>
+//    basic_regex(const basic_string<charT, ST, SA>& s);
+
+#include <regex>
+#include <cassert>
+#include "test_macros.h"
+
+static bool error_badbackref_thrown(const char *pat)
+{
+    bool result = false;
+    try {
+        std::regex re(pat);
+    } catch (const std::regex_error &ex) {
+        result = (ex.code() == std::regex_constants::error_backref);
+    }
+    return result;
+}
+
+int main()
+{
+    assert(error_badbackref_thrown("\\1abc"));      // no references
+    assert(error_badbackref_thrown("ab(c)\\2def")); // only one reference
+
+//  this should NOT throw, because we only should look at the '1'
+//  See https://llvm.org/bugs/show_bug.cgi?id=31387
+    {
+    const char *pat1 = "a(b)c\\1234";
+    std::regex re(pat1, pat1 + 7); // extra chars after the end.
+    }
+}
-- 
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