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      1 // RUN: %clang_cc1 -fsyntax-only -verify -std=c++11 %s
      2 
      3 void f();
      4 
      5 // Test typeof(expr) canonicalization
      6 template<typename T, T N>
      7 void f0(T x, decltype(f(N, x)) y) { } // expected-note{{previous}}
      8 
      9 template<typename T, T N>
     10 void f0(T x, decltype((f)(N, x)) y) { }
     11 
     12 template<typename U, U M>
     13 void f0(U u, decltype(f(M, u))) { } // expected-error{{redefinition}}
     14 
     15 // PR12438: Test sizeof...() canonicalization
     16 template<int> struct N {};
     17 
     18 template<typename...T>
     19 N<sizeof...(T)> f1() {} // expected-note{{previous}}
     20 
     21 template<typename, typename...T>
     22 N<sizeof...(T)> f1() {}
     23 
     24 template<class...U>
     25 N<sizeof...(U)> f1() {} // expected-error{{redefinition}}
     26