Tuples not supported by @cuda

[juliagpu]

Tuples not supported by @cuda

[maleadt]

This is just tuples not being supported yet by CUDAnative:

using CUDAnative, CUDAdrv

@target ptx function kernel(keeps, out)
    if keeps[1]
        out[1] = 1
    else
        out[1] = 2
    end
    nothing
end

dev = CuDevice(0)
ctx = CuContext(dev)

keeps = (true,)
d_out = CuArray(Int32, 1)
@cuda (1,1) kernel(keeps, d_out)
Array(d_out)

destroy(ctx)