inheriting constructors (ISO 2011 sec 12.9 para 7)

I am trying out example from ISO 2011 sec 12.9 para 7.Follwing is the code i am tring to compile

int chk;
struct B1 {   B1(int){chk=9;} };
struct B2 {   B2(int){chk=10;} };
struct D2 : B1, B2 {
       using B1::B1;
       using B2::B2;
      D2(int){chk=0;};  
};
int main(){
  B1 b(9);
  D2 d(0);
  return 0;
}

$g++ -std=c++11 sample.cpp Error message

 <source>: In constructor 'D2::D2(int)': <source>:7:10: error: no matching function for call to 'B1::B1()'    D2(int){chk=0;};
      ^ <source>:2:15: note: candidate: B1::B1(int)  struct B1 {   B1(int){chk=9;} };
           ^~ <source>:2:15: note:   candidate expects 1 argument, 0 provided <source>:2:8: note: candidate: constexpr B1::B1(const B1&)  struct B1 {   B1(int){chk=9;} };
    ^~ <source>:2:8: note:   candidate expects 1 argument, 0 provided <source>:2:8: note: candidate: constexpr B1::B1(B1&&) <source>:2:8: note:   candidate expects 1 argument, 0 provided <source>:7:10: error: no matching function for call to 'B2::B2()'    D2(int){chk=0;};
      ^ <source>:3:15: note: candidate: B2::B2(int)  struct B2 {   B2(int){chk=10;} };
           ^~ <source>:3:15: note:   candidate expects 1 argument, 0 provided <source>:3:8: note: candidate: constexpr B2::B2(const B2&)  struct B2 {   B2(int){chk=10;} };
    ^~ <source>:3:8: note:   candidate expects 1 argument, 0 provided <source>:3:8: note: candidate: constexpr B2::B2(B2&&) <source>:3:8: note:   candidate expects 1 argument, 0 provided Compiler exited with result code 1

Is this a bug in gcc?Why is it looking for B1()?I am using gcc 6.3.0