14ef447d12
Weaken guarantee around advancing underlying iterators in zip The current guarantee (introduced in #52279) is too strong as it prevents adapters from exploiting knowledge about the iterator length and using counted loops for example because they would stop calling `next()` before it ever returned `None`. Additionally several nested zip iterators already fail to uphold this. This does not yet remove any of the specialization code that tries (and sometimes fails) to uphold the guarantee for `next()` because removing it would also affect `next_back()` in more surprising ways. The intent is to be able to remove for example this branch |
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| .. | ||
| alloc | ||
| backtrace@b02ed04a7e | ||
| core | ||
| panic_abort | ||
| panic_unwind | ||
| portable-simd | ||
| proc_macro | ||
| profiler_builtins | ||
| rtstartup | ||
| rustc-std-workspace-alloc | ||
| rustc-std-workspace-core | ||
| rustc-std-workspace-std | ||
| std | ||
| stdarch@cfba59fccd | ||
| test | ||
| unwind | ||