[rand.dist.norm.f]

llvm-svn: 104035
diff --git a/libcxx/include/chrono b/libcxx/include/chrono
index 911a95e..1c79c68 100644
--- a/libcxx/include/chrono
+++ b/libcxx/include/chrono
@@ -264,7 +264,7 @@
 
 template <class _Rep, class _Period = ratio<1> > class duration;
 
-template <class T>
+template <class _Tp>
 struct __is_duration : false_type {};
 
 template <class _Rep, class _Period>