std::array incomplete type error with an array of std::tuple

I am getting some strange behaviour with a C++11 `std::array`. When I try to compile with `std::array<std::tuple<int, float>, 6> myTuples;` as a member variable, I get these errors: `mingw32\4.7.2\include\c++\array:-1: In instantiation of 'struct std::array<std::tuple<int, float>, 6u>':` `mingw32\4.7.2\include\c++\array:77: error: 'std::array<_Tp, _Nm>::_M_instance' has incomplete type` I'm not sure if any of this changes anything but the class it is in is a template class derived from another template class. The template parameter is an `unsigned int` an determines the size of a protected `std::array` in the base class, which I reference in the derived class `using Base<param>::m_array;`. The derived class has various `glm::vec3/dmat4/quat` types, and uses OpenGL fixed function `glBegin(GL_QUADS);` stuff. I'm using SDL-1.2.15 to create an OpenGL context. I think most of that was irrelevant, but maybe not. I could paste code, but everything is interconnected, so it can only be compiled as a whole (which distributed between sources is around a thousand or so lines). However, when I include this same line in this ideone example, in very similar circumstances, it compiles perfectly fine. I checked that it wasn't just my compiler (MinGW g++ version 4.7.2) by compiling the same on my compiler with command line `g++ -Wall -std=c++11` Does anyone know why I might get these errors? I had some problems before with the compiler crashing while parsing `std::array` assignment (using `array = {{a,b,c}};` for a default parameter), but this time its a compiler error not crash.