UndefVarError: not defined

This code will result an error `LoadError: UndefVarError: a#259 not defined`.
```julia
using Polyester
function test()
    a = zeros(3)
    @batch for i in 1:3
        if false
            a = zeros(3)
        end
        a[i] = 1.0
    end
end
test()
```
But it will be OK when I use Threads.@threads. Is it a bug?

Thank you very much.