Lifted intersperse and intersperse_with Fused transformation and updated documentation + tests#153880
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Oh didn't realize jhpratt is off rotation. Then, r? libs |
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…Mark-Simulacrum Lifted intersperse and intersperse_with Fused transformation and updated documentation + tests This PR once again builds on top of rust-lang#152855. From the discussion in rust-lang#152855, libs team came to the conclusion that `intersperse`/`intersperse_with` shouldn't transform the given iterator to a fused iterator always and a separator should be emitted between `Some(_)` items for non fused iterators (particularly just right before the subsequent `Some(_)`). On top of the change Zakarumych added in the PR, I lifted the `FusedIterator` trait and transformation of the inner `iter` for `Intersperse`/`IntersperseWith`, so that we can display this behavior. I've adjusted the documentation and tests accordingly to reflect this change as well. r? @jhpratt
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Mar 22, 2026
…Mark-Simulacrum Lifted intersperse and intersperse_with Fused transformation and updated documentation + tests This PR once again builds on top of rust-lang#152855. From the discussion in rust-lang#152855, libs team came to the conclusion that `intersperse`/`intersperse_with` shouldn't transform the given iterator to a fused iterator always and a separator should be emitted between `Some(_)` items for non fused iterators (particularly just right before the subsequent `Some(_)`). On top of the change Zakarumych added in the PR, I lifted the `FusedIterator` trait and transformation of the inner `iter` for `Intersperse`/`IntersperseWith`, so that we can display this behavior. I've adjusted the documentation and tests accordingly to reflect this change as well. r? @jhpratt
JonathanBrouwer
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Mar 22, 2026
…Mark-Simulacrum Lifted intersperse and intersperse_with Fused transformation and updated documentation + tests This PR once again builds on top of rust-lang#152855. From the discussion in rust-lang#152855, libs team came to the conclusion that `intersperse`/`intersperse_with` shouldn't transform the given iterator to a fused iterator always and a separator should be emitted between `Some(_)` items for non fused iterators (particularly just right before the subsequent `Some(_)`). On top of the change Zakarumych added in the PR, I lifted the `FusedIterator` trait and transformation of the inner `iter` for `Intersperse`/`IntersperseWith`, so that we can display this behavior. I've adjusted the documentation and tests accordingly to reflect this change as well. r? @jhpratt
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…uwer Rollup of 22 pull requests Successful merges: - #122668 (Add APIs for dealing with titlecase) - #152543 (privacy: Fix type privacy holes in RPITITs) - #153107 (Optimize BTreeMap::append() using CursorMut) - #153312 (Packages as namespaces part 1) - #153534 (Remove a flaky `got_timeout` assert from two channel tests) - #153718 (Fix environ on FreeBSD with cdylib targets that use -Wl,--no-undefined .) - #153857 (Rename `target.abi` to `target.cfg_abi` and enum-ify llvm_abiname) - #153880 (Lifted intersperse and intersperse_with Fused transformation and updated documentation + tests) - #153931 (remove usages of to-be-deprecated numeric constants) - #150630 (Unknown -> Unsupported compression algorithm) - #153491 (Move `freeze_*` methods to `OpenOptionsExt2`) - #153582 (Simplify find_attr! for HirId usage) - #153623 (std: move `sys::pal::os` to `sys::paths`) - #153647 (docs(fs): Clarify That File::lock Coordinates Across Processes) - #153936 (Skip stack_start_aligned for immediate-abort) - #154011 (implement `BinaryHeap::as_mut_slice`) - #154167 (ui/lto: move and rename two tests from issues/) - #154174 (allow `incomplete_features` in most UI tests) - #154175 (Add new alias for Guillaume Gomez email address) - #154182 (diagnostics: avoid ICE for undeclared generic parameter in impl) - #154188 (Update the tracking issue for #[diagnostic::on_move]) - #154201 (Use enums to clarify `DepNodeColorMap` color marking )
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…uwer Rollup of 22 pull requests Successful merges: - #122668 (Add APIs for dealing with titlecase) - #152543 (privacy: Fix type privacy holes in RPITITs) - #153107 (Optimize BTreeMap::append() using CursorMut) - #153312 (Packages as namespaces part 1) - #153534 (Remove a flaky `got_timeout` assert from two channel tests) - #153718 (Fix environ on FreeBSD with cdylib targets that use -Wl,--no-undefined .) - #153857 (Rename `target.abi` to `target.cfg_abi` and enum-ify llvm_abiname) - #153880 (Lifted intersperse and intersperse_with Fused transformation and updated documentation + tests) - #153931 (remove usages of to-be-deprecated numeric constants) - #150630 (Unknown -> Unsupported compression algorithm) - #153491 (Move `freeze_*` methods to `OpenOptionsExt2`) - #153582 (Simplify find_attr! for HirId usage) - #153623 (std: move `sys::pal::os` to `sys::paths`) - #153647 (docs(fs): Clarify That File::lock Coordinates Across Processes) - #153936 (Skip stack_start_aligned for immediate-abort) - #154011 (implement `BinaryHeap::as_mut_slice`) - #154167 (ui/lto: move and rename two tests from issues/) - #154174 (allow `incomplete_features` in most UI tests) - #154175 (Add new alias for Guillaume Gomez email address) - #154182 (diagnostics: avoid ICE for undeclared generic parameter in impl) - #154188 (Update the tracking issue for #[diagnostic::on_move]) - #154201 (Use enums to clarify `DepNodeColorMap` color marking )
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…uwer Rollup of 21 pull requests Successful merges: - #152543 (privacy: Fix type privacy holes in RPITITs) - #153107 (Optimize BTreeMap::append() using CursorMut) - #153312 (Packages as namespaces part 1) - #153534 (Remove a flaky `got_timeout` assert from two channel tests) - #153718 (Fix environ on FreeBSD with cdylib targets that use -Wl,--no-undefined .) - #153857 (Rename `target.abi` to `target.cfg_abi` and enum-ify llvm_abiname) - #153880 (Lifted intersperse and intersperse_with Fused transformation and updated documentation + tests) - #153931 (remove usages of to-be-deprecated numeric constants) - #150630 (Unknown -> Unsupported compression algorithm) - #153491 (Move `freeze_*` methods to `OpenOptionsExt2`) - #153582 (Simplify find_attr! for HirId usage) - #153623 (std: move `sys::pal::os` to `sys::paths`) - #153647 (docs(fs): Clarify That File::lock Coordinates Across Processes) - #153936 (Skip stack_start_aligned for immediate-abort) - #154011 (implement `BinaryHeap::as_mut_slice`) - #154167 (ui/lto: move and rename two tests from issues/) - #154174 (allow `incomplete_features` in most UI tests) - #154175 (Add new alias for Guillaume Gomez email address) - #154182 (diagnostics: avoid ICE for undeclared generic parameter in impl) - #154188 (Update the tracking issue for #[diagnostic::on_move]) - #154201 (Use enums to clarify `DepNodeColorMap` color marking )
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Mar 26, 2026
…uwer Rollup of 21 pull requests Successful merges: - rust-lang/rust#152543 (privacy: Fix type privacy holes in RPITITs) - rust-lang/rust#153107 (Optimize BTreeMap::append() using CursorMut) - rust-lang/rust#153312 (Packages as namespaces part 1) - rust-lang/rust#153534 (Remove a flaky `got_timeout` assert from two channel tests) - rust-lang/rust#153718 (Fix environ on FreeBSD with cdylib targets that use -Wl,--no-undefined .) - rust-lang/rust#153857 (Rename `target.abi` to `target.cfg_abi` and enum-ify llvm_abiname) - rust-lang/rust#153880 (Lifted intersperse and intersperse_with Fused transformation and updated documentation + tests) - rust-lang/rust#153931 (remove usages of to-be-deprecated numeric constants) - rust-lang/rust#150630 (Unknown -> Unsupported compression algorithm) - rust-lang/rust#153491 (Move `freeze_*` methods to `OpenOptionsExt2`) - rust-lang/rust#153582 (Simplify find_attr! for HirId usage) - rust-lang/rust#153623 (std: move `sys::pal::os` to `sys::paths`) - rust-lang/rust#153647 (docs(fs): Clarify That File::lock Coordinates Across Processes) - rust-lang/rust#153936 (Skip stack_start_aligned for immediate-abort) - rust-lang/rust#154011 (implement `BinaryHeap::as_mut_slice`) - rust-lang/rust#154167 (ui/lto: move and rename two tests from issues/) - rust-lang/rust#154174 (allow `incomplete_features` in most UI tests) - rust-lang/rust#154175 (Add new alias for Guillaume Gomez email address) - rust-lang/rust#154182 (diagnostics: avoid ICE for undeclared generic parameter in impl) - rust-lang/rust#154188 (Update the tracking issue for #[diagnostic::on_move]) - rust-lang/rust#154201 (Use enums to clarify `DepNodeColorMap` color marking )
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This PR once again builds on top of #152855. From the discussion in #152855, libs team came to the conclusion that
intersperse/intersperse_withshouldn't transform the given iterator to a fused iterator always and a separator should be emitted betweenSome(_)items for non fused iterators (particularly just right before the subsequentSome(_)).On top of the change Zakarumych added in the PR, I lifted the
FusedIteratortrait and transformation of the inneriterforIntersperse/IntersperseWith, so that we can display this behavior. I've adjusted the documentation and tests accordingly to reflect this change as well.r? @jhpratt