`IntegerToZeroOneBridge` not working? (Alpine)

[LebedevRI]

using JuMP
import HiGHS
import Alpine
import Ipopt
import SCIP

function main()
    model = Model(
        optimizer_with_attributes(
            Alpine.Optimizer,
            "nlp_solver"   => optimizer_with_attributes(Ipopt.Optimizer, "print_level" => 0),
            "mip_solver"   => optimizer_with_attributes(HiGHS.Optimizer, "output_flag" => false),
            "minlp_solver" => optimizer_with_attributes(SCIP.Optimizer,  "display/verblevel" => 0),
            "time_limit" => 10.0,
        ),
    )

    @variable(model, 0 <= X <= 2, Int)

    print(model)
    optimize!(model)
    solution_summary(model)
    @assert is_solved_and_feasible(model)
    @show value.(NumHardWires)
end

main()

currently yields

Alpine does not support MINLPs with generic integer (non-binary) variables yet!

Stacktrace:
  [1] error(s::String)
    @ Base ./error.jl:35
  [2] load!(m::Alpine.Optimizer)
    @ Alpine ~/.julia/packages/Alpine/2DP5q/src/main_algorithm.jl:100
  [3] optimize!(m::Alpine.Optimizer)
    @ Alpine ~/.julia/packages/Alpine/2DP5q/src/main_algorithm.jl:151
  [4] optimize!
    @ ~/.julia/packages/MathOptInterface/2CULs/src/Bridges/bridge_optimizer.jl:380 [inlined]
  [5] optimize!
    @ ~/.julia/packages/MathOptInterface/2CULs/src/MathOptInterface.jl:85 [inlined]
  [6] optimize!(m::MathOptInterface.Utilities.CachingOptimizer{MathOptInterface.Bridges.LazyBridgeOptimizer{Alpine.Optimizer}, MathOptInterface.Utilities.UniversalFallback{MathOptInterface.Utilities.Model{Float64}}})
    @ MathOptInterface.Utilities ~/.julia/packages/MathOptInterface/2CULs/src/Utilities/cachingoptimizer.jl:316
  [7] optimize!(model::Model; ignore_optimize_hook::Bool, _differentiation_backend::MathOptInterface.Nonlinear.SparseReverseMode, kwargs::@Kwargs{})
    @ JuMP ~/.julia/packages/JuMP/7rBNn/src/optimizer_interface.jl:595
  [8] optimize!
    @ ~/.julia/packages/JuMP/7rBNn/src/optimizer_interface.jl:546 [inlined]
  [9] main()
    @ Main ./In[10]:21
 [10] top-level scope
    @ In[10]:27

I thought https://github.com/jump-dev/MathOptInterface.jl/pull/2205 was intended to resolve that, but apparently something is going wrong?

Refs. https://github.com/lanl-ansi/Alpine.jl/issues/233

[odow]

The issue is that Alpine says "yes, I support integer variables" so that it can throw a nicer error: https://github.com/lanl-ansi/Alpine.jl/blob/a1849ddf464a9a567eeb9bb7c9707c77bbccbf88/src/MOI_wrapper/MOI_wrapper.jl#L325-L331

Things will probably work if we remove that line.

Closing because this is not a bug in MOI. I'll open an issue in Alpine.jl: https://github.com/lanl-ansi/Alpine.jl/issues/244

[LebedevRI]

@odow thank you! I wasn't quite sure where i should post this issue.