please help. In the following, using a `@boundscheck`

would cause a mysterious `Core.Box`

. How to solve it??? using 1.1.0, thanks.

```
function fun1()
nthreads = Threads.nthreads()
x = zeros(200)
Threads.@threads for t in Base.OneTo(nthreads)
for i in t:nthreads:200
x[i] = t + i
end
end
return Statistics.mean(x)
end
function fun2()
@boundscheck 2 >= 1 || error() # the ONLY difference
nthreads = Threads.nthreads()
x = zeros(200)
Threads.@threads for t in Base.OneTo(nthreads)
for i in t:nthreads:200
x[i] = t + i
end
end
return Statistics.mean(x)
end
julia> @code_warntype fun1() # fine
julia> @code_warntype fun2()
Body::Any
1 ── %1 = %new(Core.Box)::Core.Box
```