LinearAlgebra/addmul/mul!(::Matrix{Int64}, ::LinearAlgebra.Diagonal{Int64, V} where V<:AbstractVector{Int64}, ::LinearAlgebra.SymTridiagonal{Int64, V} where V<:AbstractVector{Int64}, α, β)/α = 2, β = false/adjoint and transpose/fa = transpose, fb = adjoint @test returned_mat === Ccopy