I have upgraded to julia 1.7.1 and I encounter a weird error perhaps related to the Winston library.

```
julia> using Winston
julia> flatten6(A) = [[isa(x,Array) ? flatten6(x) : x for x in A]...;]
flatten6 (generic function with 1 method)
julia> flatten6(Any[1,Any[]])
ERROR: DimensionMismatch("tried to assign 0 elements to 2 destinations")
Stacktrace:
[1] throw_setindex_mismatch(X::Vector{Any}, I::Tuple{Int64})
@ Base ./indices.jl:191
[2] setindex_shape_check
@ ./indices.jl:245 [inlined]
[3] setindex!
@ ./array.jl:910 [inlined]
[4] __cat_offset1!(A::Vector{Any}, shape::Tuple{Int64}, catdims::Tuple{Bool}, offsets::Tuple{Int64}, x::Vector{Any})
@ Base ./abstractarray.jl:1731
[5] __cat_offset!
@ ./abstractarray.jl:1721 [inlined]
[6] __cat_offset!
@ ./abstractarray.jl:1722 [inlined]
[7] __cat
@ ./abstractarray.jl:1717 [inlined]
[8] _cat_t
@ ./abstractarray.jl:1713 [inlined]
[9] #cat_t#136
@ ./abstractarray.jl:1705 [inlined]
[10] _cat
@ ./abstractarray.jl:1703 [inlined]
[11] #cat#141
@ ./abstractarray.jl:1861 [inlined]
[12] vcat(::Int64, ::Vector{Any})
@ Base ./abstractarray.jl:1772
[13] flatten6(A::Vector{Any})
@ Main ./REPL[2]:1
[14] top-level scope
@ REPL[3]:1
```

If I don’t load Winston, I don’t get the error. Under a previous version of Julia (1.7 and I think 1.6.2), I was not getting the error, Winston loaded or not. I am not sure that this is a problem with Winston since it has seen no upgrade recently and no bug showed up with julia 1.7 and 1.6.2. Any hint about what is going wrong here?