[Bug libstdc++/90509] failing typing std::transform with policies on std::insert_iterator

[maurizio.drocco at pnnl dot gov]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=90509

--- Comment #4 from Maurizio Drocco <maurizio.drocco at pnnl dot gov> ---
Sorry I was forgetting the requirement, thank you for remarking it.