I think this may be a bug and reported it.

Now I wonder if this a artifact error because other math function like `abs`

are not work too. But, what caused it?

I think this may be a bug and reported it.

Now I wonder if this a artifact error because other math function like `abs`

are not work too. But, what caused it?

`CUDA.sqrt`

is GPU only. The following code is OK.

```
using CUDA
function sqrt_kernel!(res, val)
res[begin] = CUDA.sqrt(val)
return
end
res = cu([0.0])
@cuda sqrt_kernel!(res, 12.34)
println(res[begin])
```

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