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diff --git a/libstdc++-v3/testsuite/21_strings/c_strings/wchar_t/3.cc b/libstdc++-v3/testsuite/21_strings/c_strings/wchar_t/3.cc
new file mode 100644
index 00000000..47c653ab
--- /dev/null
+++ b/libstdc++-v3/testsuite/21_strings/c_strings/wchar_t/3.cc
@@ -0,0 +1,35 @@
+// { dg-do compile { target correct_iso_cpp_string_wchar_protos } }
+// { dg-options "-O2" }
+
+#include <cwchar>
+
+const wchar_t *cw1, *cw2;
+wchar_t *w1, *w2;
+
+void
+test01 ()
+{
+  w1 = wmemchr (w2, L'/', 3);
+  w1 = wcschr (w2, L'/');
+  w1 = wcspbrk (w2, L"abc");
+  w1 = wcsrchr (w2, L'c');
+  w1 = wcsstr (w2, L"abc");
+
+  cw1 = wmemchr (w2, L'/', 3);
+  cw1 = wcschr (w2, L'/');
+  cw1 = wcspbrk (w2, L"abc");
+  cw1 = wcsrchr (w2, L'c');
+  cw1 = wcsstr (w2, L"abc");
+
+  w1 = wmemchr (cw2, L'/', 3);		// { dg-error "invalid conversion" }
+  w1 = wcschr (cw2, L'/');		// { dg-error "invalid conversion" }
+  w1 = wcspbrk (cw2, L"abc");		// { dg-error "invalid conversion" }
+  w1 = wcsrchr (cw2, L'c');		// { dg-error "invalid conversion" }
+  w1 = wcsstr (cw2, L"abc");		// { dg-error "invalid conversion" }
+
+  cw1 = wmemchr (cw2, L'/', 3);
+  cw1 = wcschr (cw2, L'/');
+  cw1 = wcspbrk (cw2, L"abc");
+  cw1 = wcsrchr (cw2, L'c');
+  cw1 = wcsstr (cw2, L"abc");
+}