`@set` with slices or broadcasting about accessors.jl

[Jollywatt]

You might have to be the one to open that StaticArrays issue, @aplavin — I've completely forgotten what this is all about!

[jw3126]

Thanks a lot for reporting! Broadcasting is tricky and not supported right now. Though I agree it would be nice to have. The

julia> @set s[2:3] += [100, 100] # slicing fails ungracefully
ERROR: StackOverflowError:

is a bug I would say. The ideal approach to fixing it would be to fix the following in StaticArrays.jl:

julia> Base.setindex(@SVector[1,2,3], [1,2], 1:2)
ERROR: StackOverflowError:
Stacktrace:
 [1] setindex(a::SVector{3, Int64}, x::Vector{Int64}, inds::UnitRange{Int64}) (repeats 79984 times)
   @ StaticArrays ~/.julia/packages/StaticArrays/6QFsp/src/deque.jl:198

and wait for this PR to land.
If you want to get this fixed faster I am happy to guide you.

[aplavin]

and wait for this JuliaLang/julia#46453 to land.

I don't think this is necessary. Just fixing StaticArrays setindex should be enough - it's just called in Accessors as is:

Accessors.jl/src/staticarrays.jl

Line 3 in f0a65fe

@inline setindex(a::StaticArrays.StaticArray, args...) = Base.setindex(a, args...)

[jw3126]

Ah thanks you are right @aplavin

[aplavin]

Broadcasting is now supported (Accessors#master, to be released soon)! All examples from the first post work on Vectors.
The remaining SVector issues are because of their setindex method that leads to StackOverflow - yes, it is still the case. When that is fixed, Accessors will support it without any further changes.
Would be useful if you opened an issue in the StaticArrays repo!