libcxx initial import

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@103490 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/test/strings/basic.string/string.cons/char_assignment.pass.cpp b/test/strings/basic.string/string.cons/char_assignment.pass.cpp
new file mode 100644
index 0000000..b945b1b
--- /dev/null
+++ b/test/strings/basic.string/string.cons/char_assignment.pass.cpp
@@ -0,0 +1,36 @@
+//===----------------------------------------------------------------------===//
+//
+// ÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊThe LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+// <string>
+
+// basic_string<charT,traits,Allocator>& operator=(charT c);
+
+#include <string>
+#include <cassert>
+
+template <class S>
+void
+test(S s1, typename S::value_type s2)
+{
+    typedef typename S::traits_type T;
+    s1 = s2;
+    assert(s1.__invariants());
+    assert(s1.size() == 1);
+    assert(T::eq(s1[0], s2));
+    assert(s1.capacity() >= s1.size());
+}
+
+int main()
+{
+    typedef std::string S;
+    test(S(), 'a');
+    test(S("1"), 'a');
+    test(S("123456789"), 'a');
+    test(S("1234567890123456789012345678901234567890123456789012345678901234567890"), 'a');
+}