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      1 // RUN: %clang_cc1 -std=c++11 %s -verify
      2 // RUN: %clang_cc1 -std=c++1y %s -verify -DCXX1Y
      3 
      4 struct X {
      5   constexpr int f(); // @5
      6   int f();           // @6
      7 };
      8 
      9 #ifdef CXX1Y
     10 // FIXME: Detect this situation and provide a better recovery.
     11 
     12 // expected-error@6 {{class member cannot be redeclared}}
     13 // expected-note@5 {{previous}}
     14 // expected-error@6 {{non-constexpr declaration of 'f' follows constexpr declaration}}
     15 // expected-note@5 {{previous}}
     16 #else
     17 // expected-warning@5 {{'constexpr' non-static member function will not be implicitly 'const' in C++1y; add 'const' to avoid a change in behavior}}
     18 #endif
     19