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Rollup merge of rust-lang#81741 - sdroege:zip-trusted-random-access-specialization-panic-safety, r=KodrAus
Increment `self.index` before calling `Iterator::self.a.__iterator_ge…
…`t_unchecked` in `Zip` `TrustedRandomAccess` specialization
Otherwise if `Iterator::self.a.__iterator_get_unchecked` panics the
index would not have been incremented yet and another call to
`Iterator::next` would read from the same index again, which is not
allowed according to the API contract of `TrustedRandomAccess` for
`!Clone`.
Fixesrust-lang#81740
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