core: drop unmapped ZSTs in array map#152487
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joboet wants to merge 1 commit intorust-lang:mainfrom
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Fixes #152211.
Alternative to #152220 and #152248.
This makes the
Draintype use the same ZST-handling strategy asslice::IterMut, which stores the remaining length instead of a one-past-the-end pointer when the type is a ZST. I've also removed the const-genericNparameter fromDrainto avoid unnecessary monomorphizations.