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581e7417ce
More `IS_ZST` in `library` I noticed that `post_inc_start` and `pre_dec_end` were doing this check in different ways https://github.com/rust-lang/rust/blob/d19b64fb54391b64ce99981577c67c93ac2a9ffa/library/core/src/slice/iter/macros.rs#L76-L93 so started making this PR, then added a few more I found since I was already making changes anyway.