Update.

* libio/Makefile (tests): Add tst-sscanf.
	* libio/tst-sscanf.c: New file.

libio/tst-sscanf.c

@@ -0,0 +1,20 @@
+#include <stdio.h>
+#include <wchar.h>
+
+#define WCS_LENGTH 256
+
+int
+main (void)
+{
+  const char cnv[] ="%l[abc]";
+  const char str[] = "abbcXab";
+  wchar_t wcs[WCS_LENGTH];
+  int result = 0;
+
+  sscanf (str, cnv, wcs);
+  printf ("wcs = \"%ls\"\n", wcs);
+  fflush (stdout);
+  result = wcscmp (wcs, L"abbc") != 0;
+
+  return result;
+}