Add some tests to ensure that the __regex_word does not conflict with any of ctype_base's values.
Hopefully this will catch cases like https://llvm.org/bugs/show_bug.cgi?id=26476 in the future.
git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@260527 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/test/std/re/re.traits/lookup_classname.pass.cpp b/test/std/re/re.traits/lookup_classname.pass.cpp
index 0b1b18e..d3e5a5c 100644
--- a/test/std/re/re.traits/lookup_classname.pass.cpp
+++ b/test/std/re/re.traits/lookup_classname.pass.cpp
@@ -33,6 +33,19 @@
int main()
{
+// if __regex_word is not distinct from all the classes, bad things happen
+// See https://llvm.org/bugs/show_bug.cgi?id=26476 for an example.
+ assert((std::ctype_base::space & std::regex_traits<char>::__regex_word) == 0);
+ assert((std::ctype_base::print & std::regex_traits<char>::__regex_word) == 0);
+ assert((std::ctype_base::cntrl & std::regex_traits<char>::__regex_word) == 0);
+ assert((std::ctype_base::upper & std::regex_traits<char>::__regex_word) == 0);
+ assert((std::ctype_base::lower & std::regex_traits<char>::__regex_word) == 0);
+ assert((std::ctype_base::alpha & std::regex_traits<char>::__regex_word) == 0);
+ assert((std::ctype_base::digit & std::regex_traits<char>::__regex_word) == 0);
+ assert((std::ctype_base::punct & std::regex_traits<char>::__regex_word) == 0);
+ assert((std::ctype_base::xdigit & std::regex_traits<char>::__regex_word) == 0);
+ assert((std::ctype_base::blank & std::regex_traits<char>::__regex_word) == 0);
+
test("d", std::ctype_base::digit);
test("D", std::ctype_base::digit);
test("d", std::ctype_base::digit, true);
