class C
{
    struct NS
    {
        struct NNS
        {
            int i;
        };
    };
};

void main() : SV_Target0
{
    C::NS::NNS a;
    a.i = 2;
}

// fxc: this program fails with: "nested-structs.azsl(3,12-13): error X3000: syntax error: unexpected token 'NS'"

// dxc: accepted and results in:
/*
!0 = !{!"clang version 3.7 (tags/RELEASE_370/final)"}
!1 = !{i32 1, i32 2}
!2 = !{i32 1, i32 3}
!3 = !{!"ps", i32 6, i32 2}
!4 = !{i32 0, %"struct.C::NS::NNS" undef, !5}
!5 = !{i32 4, !6}
!6 = !{i32 6, !"i", i32 3, i32 0, i32 7, i32 4}
!7 = !{i32 1, void ()* @main, !8}
!8 = !{!9}
!9 = !{i32 1, !10, !11}
!10 = !{i32 4, !"SV_Target0"}
!11 = !{}
!12 = !{void ()* @main, !"main", null, null, null}
*/