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std::tuple doesn't work with ::testing::Combine

cc @p12tic

After 180f0c64 I now get this:

../tests/server/input.cpp:1206:43: error: could not convert ‘testing::Combine<testing::internal::ValueArray3<MatrixType, MatrixType, MatrixType>, testing::internal::ValueArray2<int, int> >(testing::Values<MatrixType, MatrixType, MatrixType>(IDENTITY, LEFT_HALF, RIGHT_HALF), testing::Values<int, int>(1, 2))’ from ‘testing::internal::CartesianProductHolder2<testing::internal::ValueArray3<MatrixType, MatrixType, MatrixType>, testing::internal::ValueArray2<int, int> >’ to ‘testing::internal::ParamGenerator<std::tuple<MatrixType, int> >’
 1206 |                         ::testing::Combine(::testing::Values(IDENTITY, LEFT_HALF, RIGHT_HALF),
      |                         ~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
      |                                           |
      |                                           testing::internal::CartesianProductHolder2<testing::internal::ValueArray3<MatrixType, MatrixType, MatrixType>, testing::internal::ValueArray2<int, int> >
 1207 |                                            ::testing::Values(1, 2)));
      |                                            ~~~~~~~~~~~~~~~~~~~~~~~~

Unclear what exactly is going wrong here, but reverting to use std::tr1::tuple make it work again.