Heads up about test error in JuMP for upcoming 1.3 RC-2.

[KristofferC]

When running this package test on what will be Julia 1.3-RC2 an error occured which is reproduced by the script below:

julia> using JuMP, SparseArrays

julia> ModelType = Model; VariableRefType = VariableRef

julia> model = ModelType()

julia> @variable(model, x[1:3])

julia> A = [2 1 0
            1 2 1
            0 1 2]

julia> B = sparse(A)

julia> @variable(model, X11)

julia> @variable(model, X23)

julia> X = sparse([1, 2], [1, 3], [X11, X23], 3, 3)

julia> A * X'

julia> A * X'
ERROR: MethodError: no method matching _mul!(::Array{GenericAffExpr{Float64,VariableRef},2}, ::Array{Int64,2}, ::LinearAlgebra.Adjoint{VariableRef,SparseMatrixCSC{VariableRef,Int64}}, ::GenericAffExpr{Float64,VariableRef}, ::GenericAffExpr{Float64,VariableRef})
Closest candidates are:
  _mul!(::Union{AbstractArray{#s38,1}, AbstractArray{#s38,2}} where #s38<:(Union{GenericAffExpr{C,V}, GenericQuadExpr{C,V}} where V where C), ::Union{LinearAlgebra.Adjoint{#s37,#s27}, LinearAlgebra.Transpose{#s37,#s27}} where #s27<:SparseMatrixCSC where #s37, ::Union{AbstractArray{T,1}, AbstractArray{T,2}} where T, ::Any, ::Any) at /home/kristofferc/.julia/dev/JuMP/src/operators.jl:404
  _mul!(::Union{AbstractArray{#s90,1}, AbstractArray{#s90,2}} where #s90<:(Union{GenericAffExpr{C,V}, GenericQuadExpr{C,V}} where V where C), ::SparseMatrixCSC, ::Union{AbstractArray{T,1}, AbstractArray{T,2}} where T, ::Any, ::Any) at /home/kristofferc/.julia/dev/JuMP/src/operators.jl:430
  _mul!(::Union{AbstractArray{#s89,1}, AbstractArray{#s89,2}} where #s89<:(Union{GenericAffExpr{C,V}, GenericQuadExpr{C,V}} where V where C), ::Union{LinearAlgebra.Adjoint{#s87,#s53}, LinearAlgebra.Transpose{#s87,#s53}} where #s53<:SparseMatrixCSC where #s87, ::Union{AbstractArray{T,1}, AbstractArray{T,2}} where T, ::Any) at /home/kristofferc/.julia/dev/JuMP/src/operators.jl:404
  ...
Stacktrace:
 [1] mul!(::Array{GenericAffExpr{Float64,VariableRef},2}, ::Array{Int64,2}, ::LinearAlgebra.Adjoint{VariableRef,SparseMatrixCSC{VariableRef,Int64}}, ::GenericAffExpr{Float64,VariableRef}, ::GenericAffExpr{Float64,VariableRef}) at /home/kristofferc/.julia/dev/JuMP/src/operators.jl:534
 [2] *(::Array{Int64,2}, ::LinearAlgebra.Adjoint{VariableRef,SparseMatrixCSC{VariableRef,Int64}}) at /home/kristofferc/julia/usr/share/julia/stdlib/v1.3/SparseArrays/src/linalg.jl:154
 [3] top-level scope at REPL[20]:1

It is likely that JuMP need to update due to changes in the mul! signatures.