Const-qualified objects of class type require the class to have a

user-declared default constructor.


[SVN r61758]

libs/range

@@ -1 +1 @@
-Subproject commit c9802507abf278c30ecef16a8dd858bcb06eb1a9
+Subproject commit 5b1d0544e2cafe29b5c22276ad50f9bdd593d12d