Can't build a system with Unicode symbols in variable names

[nsajko]

julia> using DynamicPolynomials, HomotopyContinuation

julia> @polyvar c₀ c₀ₛ c₀ₒ
(c₀, c₀ₛ, c₀ₒ)

julia> System([2*c₀ + 3*c₀ₛ - 1*c₀ₒ])
ERROR: KeyError: key 'ₒ' not found
Stacktrace:
  [1] getindex(h::Dict{Char, Int64}, key::Char)
    @ Base ./dict.jl:510
  [2] #15
    @ ~/.julia/packages/HomotopyContinuation/WyXzI/src/model_kit/symbolic.jl:20 [inlined]
  [3] iterate(g::Base.Generator, s::Vararg{Any})
    @ Base ./generator.jl:48 [inlined]
  [4] collect_to!(dest::AbstractArray{T}, itr::Any, offs::Any, st::Any) where T
    @ Base ./array.jl:831 [inlined]
  [5] collect_to_with_first!(dest::AbstractArray, v1::Any, itr::Any, st::Any)
    @ Base ./array.jl:809 [inlined]
  [6] _collect(c::Vector{Char}, itr::Base.Generator{Vector{Char}, HomotopyContinuation.ModelKit.var"#15#19"}, ::Base.EltypeUnknown, isz::Base.HasShape{1})
    @ Base ./array.jl:803
  [7] collect_similar
    @ ./array.jl:702 [inlined]
  [8] map
    @ ./abstractarray.jl:3307 [inlined]
  [9] (::HomotopyContinuation.ModelKit.var"#14#18")(str_index::SubString{String})
    @ HomotopyContinuation.ModelKit ~/.julia/packages/HomotopyContinuation/WyXzI/src/model_kit/symbolic.jl:20
 [10] iterate(g::Base.Generator, s::Vararg{Any})
    @ Base ./generator.jl:48 [inlined]
 [11] _collect(c::Vector{SubString{String}}, itr::Base.Generator{Vector{SubString{String}}, HomotopyContinuation.ModelKit.var"#14#18"}, ::Base.EltypeUnknown, isz::Base.HasShape{1})
    @ Base ./array.jl:793
 [12] collect_similar
    @ ./array.jl:702 [inlined]
 [13] map
    @ ./abstractarray.jl:3307 [inlined]
 [14] sort_key(v::HomotopyContinuation.ModelKit.Variable)
    @ HomotopyContinuation.ModelKit ~/.julia/packages/HomotopyContinuation/WyXzI/src/model_kit/symbolic.jl:19
 [15] _broadcast_getindex_evalf
    @ ./broadcast.jl:677 [inlined]
 [16] _broadcast_getindex
    @ ./broadcast.jl:650 [inlined]
 [17] getindex
    @ ./broadcast.jl:604 [inlined]
 [18] macro expansion
    @ ./broadcast.jl:972 [inlined]
 [19] macro expansion
    @ ./simdloop.jl:77 [inlined]
 [20] copyto!
    @ ./broadcast.jl:971 [inlined]
 [21] copyto!
    @ ./broadcast.jl:924 [inlined]
 [22] copy
    @ ./broadcast.jl:896 [inlined]
 [23] materialize
    @ ./broadcast.jl:871 [inlined]
 [24] sort!(vs::Vector{HomotopyContinuation.ModelKit.Variable}; kwargs::@Kwargs{})
    @ HomotopyContinuation.ModelKit ~/.julia/packages/HomotopyContinuation/WyXzI/src/model_kit/symbolic.jl:27
 [25] sort!
    @ ~/.julia/packages/HomotopyContinuation/WyXzI/src/model_kit/symbolic.jl:27 [inlined]
 [26] _variables(ex::Expression)
    @ HomotopyContinuation.ModelKit ~/.julia/packages/HomotopyContinuation/WyXzI/src/model_kit/symengine.jl:531
 [27] variables(exprs::Vector{Expression}; parameters::Vector{HomotopyContinuation.ModelKit.Variable})
    @ HomotopyContinuation.ModelKit ~/.julia/packages/HomotopyContinuation/WyXzI/src/model_kit/symbolic.jl:197
 [28] variables
    @ ~/.julia/packages/HomotopyContinuation/WyXzI/src/model_kit/symbolic.jl:194 [inlined]

[saschatimme]

Seems to be an issue with DynamicPolynomials. You can use

using HomotopyContinuation
@var c₀ c₀ₛ c₀ₒ

instead

[nsajko]

I'd like to report the bug to DynamicPolynomials. Do you have any idea what the problem is there?