Replace some once(x).chain(once(y)) with [x, y] IntoIter #77514
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Now that we have by-value array iterators...
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Rollup of 11 pull requests Successful merges: - rust-lang#75853 (Use more intra-doc-links in `core::fmt`) - rust-lang#75928 (Remove trait_selection error message in specific case) - rust-lang#76329 (Add check for doc alias attribute at crate level) - rust-lang#77219 (core::global_allocator docs link to std::alloc::GlobalAlloc) - rust-lang#77395 (BTreeMap: admit the existence of leaf edges in comments) - rust-lang#77407 (Improve build-manifest to work with the improved promote-release) - rust-lang#77426 (Include scope id in SocketAddrV6::Display) - rust-lang#77439 (Fix missing diagnostic span for `impl Trait` with const generics, and add various tests for `min_const_generics` and `const_generics`) - rust-lang#77471 (BTreeMap: refactoring around edges, missed spots) - rust-lang#77512 (Allow `Abort` terminators in all const-contexts) - rust-lang#77514 (Replace some once(x).chain(once(y)) with [x, y] IntoIter) Failed merges: r? `@ghost`
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| use std::iter::once; | ||
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| once(self.type_ns).chain(once(self.value_ns)).chain(once(self.macro_ns)).filter_map(|it| it) | ||
| IntoIter::new([self.type_ns, self.value_ns, self.macro_ns]).filter_map(|it| it) |
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Frustratingly, flatten gives worse size_hints than filter_map today (#48544) and has more complicated code (needs to keep the iterator in its state after giving out an item, since unlike Option it doesn't know if that's the only item), so that's potentially a pessimization.
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Now that we have by-value array iterators that are already used...
For example,