Is there a way to use the 4-argument `@nloops` with `@generated` on Julia 1.6?

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Is there a way to use the 4-argument @nloops with @generated on Julia 1.6? Since the last argument is an anonymous function, it triggers an error about purity now. StatsBase currently uses that so it fails on nightlies: https://github.com/JuliaStats/StatsBase.jl/blob/3b0b2da5179af9696928e5ecc72794b098c4cb53/src/hist.jl#L465

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I turns out the anonymous function was not the problem. It’s just that the function included a generator, which is problematic for @generated.

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