I would like to setup a type stable function where one of the arguments is 
the result of lufact(A) where A::Array{Float64,2}. 

Here is code I wrote to test this out:

A = rand(100,100);
f = rand(100,1);
luA = lufact(A);
typeof(luA)
function test(f::Vector{Float64},luA::LU{Float64,Array{Float64,2}}) 
\(luA,f) 
end

I am relatively new to Julia, so I imagine I am missing something quite 
simple... 

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