63bacf14cd
Expand FlattenCompat folds The former `chain`+`chain`+`fold` implementation looked nice from a functional-programming perspective, but it introduced unnecessary layers of abstraction on every `flat_map`/`flatten` fold. It's straightforward to just fold each part in turn, and this makes it look like a simplified version of the existing `try_fold` implementation. For the `iter::bench_flat_map*` benchmarks, I get a large improvement in `bench_flat_map_chain_sum`, from 1,598,473 ns/iter to 499,889 ns/iter, and the rest are unchanged. |
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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 | ||