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803ddb8359
panic early when `TrustedLen` indicates a `length > usize::MAX` Changes `TrustedLen` specializations to immediately panic when `size_hint().1 == None`. As far as I can tell this is ~not a change~ a minimal change in observable behavior for anything except ZSTs because the fallback path would go through `extend_desugared()` which tries to `reserve(lower_bound)` which already is `usize::MAX` and that would also lead to a panic. Before it might have popped somewhere between zero and a few elements from the iterator before panicking while it now panics immediately. Overall this should reduce codegen by eliminating the fallback paths. While looking into the `with_capacity()` behavior I also noticed that its documentation didn't have a *Panics* section, so I added that. |
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| .. | ||
| alloc | ||
| backtrace@af078ecc0b | ||
| core | ||
| panic_abort | ||
| panic_unwind | ||
| proc_macro | ||
| profiler_builtins | ||
| rtstartup | ||
| rustc-std-workspace-alloc | ||
| rustc-std-workspace-core | ||
| rustc-std-workspace-std | ||
| std | ||
| stdarch@9c732a56f6 | ||
| term | ||
| test | ||
| unwind | ||