no errors detected

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

```julia-repl
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
```

Reproduce the Julia REPL example and the `@report_opt(sum(Squares(10)))` entry point from the issue. Investigate why the expected `zero(::Type{Any})` MethodError is not reported; done means the same example produces the expected diagnostic.

Written by the indexing model from the issue text.