no errors detected

[AbhimanyuAryan]

following the video and I see that following statement should return MethodError: no method matching zero(::Type{Any})

1.9.0-beta4>mutable struct Squares
            count::Int
            end

1.9.0-beta4>Base.iterate(S::Squares, s =1) = s> S.count ? nothing : (s^2, s+1)

1.9.0-beta4>Base.length(S::Squares) = S.count

1.9.0-beta4>using JET; @report_opt(sum(Squares(10)))
No errors detected