Binding variable from function which isn't defined in a closure to a closed variable

New to Julia
,
3

It might be that the example is oversimplfied, but note that this is perfectly fine if the type of x does not change:

julia> const x = [1,2]
2-element Vector{Int64}:
 1
 2

julia> change() = x .+= 1
change (generic function with 1 method)

julia> change()
2-element Vector{Int64}:
 2
 3

julia> change()
2-element Vector{Int64}:
 3
 4