Indexing with extra dimensions errors

[baggepinnen]

The indexing behavior is different from static vector and a normal vector when adding extra dimensions

julia> a = @SVector randn(2)
2-element SVector{2, Float64} with indices SOneTo(2):
  1.1055415819376984
 -1.376116084168465

julia> a[:, 1]
ERROR: BoundsError: attempt to access Tuple{} at index [1]
Stacktrace:
 [1] getindex(t::Tuple, i::Int64)
   @ Base ./tuple.jl:29
 [3] index_sizes
   @ ~/.julia/packages/StaticArrays/pwe3X/src/indexing.jl:81 [inlined]
 [4] getindex(::SVector{2, Float64}, ::Colon, ::Int64)
   @ StaticArrays ~/.julia/packages/StaticArrays/pwe3X/src/indexing.jl:226

julia> b = randn(2)
2-element Vector{Float64}:
  0.34780756537216645
 -1.63328724070066

julia> b[:, 1]
2-element Vector{Float64}:
  0.34780756537216645
 -1.63328724070066

[ojwoodford]

Similarly when indexing the first dimension:

julia> A = [1.0, 2.0];
julia> A[1,:]
1-element Vector{Float64}:
 1.0
julia> A = SVector(1.0, 2.0);
julia> A[1,:]
ERROR: BoundsError: attempt to access Tuple{} at index [1]
Stacktrace:
 [1] getindex(t::Tuple, i::Int64)
   @ Base ./tuple.jl:29
 [2] map(f::typeof(StaticArrays.index_size), t::Tuple{}, s::Tuple{Colon}) (repeats 2 times)
   @ Base ./tuple.jl:250
 [3] index_sizes
   @ ~/.julia/packages/StaticArrays/76ecm/src/indexing.jl:81 [inlined]
 [4] getindex(::SVector{2, Float64}, ::Int64, ::Colon)
   @ StaticArrays ~/.julia/packages/StaticArrays/76ecm/src/indexing.jl:226
 [5] top-level scope