C++ code - 7 lines

Link:

C++, pasted on Apr 2:

#include <string>

class WontCompile3{
  static const std::string s = "Yo";
};

int main(){}

Output:

1 2	Line 4: error: invalid in-class initialization of static data member of non-integral type 'const std::string' compilation terminated due to -Wfatal-errors.