Fun One Liners

General Usage
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You can also use my pkg Reduce.jl for that if you want symbolic optimized common sub-expressions

julia> using Reduce; load_package(:scope)

julia> Algebra.optimize(:(z = a^2*b^2+10*a^2*m^6+a^2*m^2+2*a*b*m^4+2*b^2*m^6+b^2*m^2))
quote
    g40 = b * a
    g44 = m * m
    g41 = g44 * b * b
    g42 = g44 * a * a
    g43 = g44 * g44
    z = g41 + g42 + g40 * (2g43 + g40) + g43 * (2g41 + 10g42)
end

or if you really want @pure you can just locally define a new method for that like I described here

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