1 // RUN: %clang_cc1 -std=c++11 -fsyntax-only -verify %s
2 // expected-no-diagnostics
3 
4 // If type deduction cannot be done for any P/A pair, or if for any
5 // pair the deduction leads to more than one possible set of deduced
6 // values, or if different pairs yield different deduced values, or if
7 // any template argument remains neither deduced nor explicitly
8 // specified, template argument deduction fails.
9 
10 template<typename ...> struct tuple;
11 
12 template<typename T, typename U>
13 struct same_tuple {
14   static const bool value = false;
15 };
16 
17 template<typename ...Types1>
18 struct same_tuple<tuple<Types1...>, tuple<Types1...> > {
19   static const bool value = true;
20 };
21 
22 int same_tuple_check1[same_tuple<tuple<int, float>, tuple<int, double>>::value? -1 : 1];
23 int same_tuple_check2[same_tuple<tuple<float, double>, tuple<float, double>>::value? 1 : -1];
24 
25