Detect and throw on a class of bad regexes that we mistakenly accepted before. Thanks to Trevor Smigiel for the report

llvm-svn: 243030

1 files changed, 1 insertions, 1 deletions

diff --git a/libcxx/test/std/re/re.regex/re.regex.construct/bad_escape.pass.cpp b/libcxx/test/std/re/re.regex/re.regex.construct/bad_escape.pass.cpp
index 9455527412b..ddf2607f112 100644
--- a/libcxx/test/std/re/re.regex/re.regex.construct/bad_escape.pass.cpp
+++ b/libcxx/test/std/re/re.regex/re.regex.construct/bad_escape.pass.cpp
@@ -22,7 +22,7 @@ static bool error_escape_thrown(const char *pat)
     bool result = false;
     try {
         std::regex re(pat);
-    } catch (std::regex_error &ex) {
+    } catch (const std::regex_error &ex) {
         result = (ex.code() == std::regex_constants::error_escape);
     }
     return result;