Implement P0253R1: Fixing a design mistake in the searchers interface.

llvm-svn: 262928
Cr-Mirrored-From: sso://chromium.googlesource.com/_direct/external/github.com/llvm/llvm-project
Cr-Mirrored-Commit: 28cc4dde490655c2bc88d0328c73ed33615cc2a8
diff --git a/include/string b/include/string
index 9150244..004dc3d 100644
--- a/include/string
+++ b/include/string
@@ -982,7 +982,7 @@
     const _CharT* __r = 
         _VSTD::__search(__p + __pos, __p + __sz,
                         __s, __s + __n, _Traits::eq,
-                        random_access_iterator_tag(), random_access_iterator_tag());
+                        random_access_iterator_tag(), random_access_iterator_tag()).first;
     if (__r == __p + __sz)
         return __npos;
     return static_cast<_SizeT>(__r - __p);