1 // PR c++/58102 2 // { dg-do compile { target c++11 } } 3 4 struct S { 5 mutable int n; SS6 constexpr S() : n() {} 7 }; 8 9 constexpr S s = {}; 10 constexpr S s2 = s; // { dg-error "mutable" } 11