/work2/00434/eijkhout/msgsl/msgsl-4.0.0/tests/span_tests.cpp:333:33: error: suggest braces around initialization of subobject [-Werror,-Wmissing-braces]
    int arr3d[2][3][2] = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12};
                                ^~~~
                                {   }