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Improve reallocation in alloc_system on Windows
Fixes https://github.com/rust-lang/rust/issues/42025
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Deprecate range-specific `step_by`
Deprecation attributes and test updates only.
Was replaced by an any-iterator version in https://github.com/rust-lang/rust/pull/41439
Last follow-up (this release) to https://github.com/rust-lang/rust/pull/42110#issuecomment-303210138
r? @alexcrichton
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Add an in-place rotate method for slices to libcore
A helpful primitive for moving chunks of data around inside a slice.
For example, if you have a range selected and are drag-and-dropping it somewhere else (Example from [Sean Parent's talk](https://youtu.be/qH6sSOr-yk8?t=560)).
(If this should be an RFC instead of a PR, please let me know.)
Edit: changed example
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A helpful primitive for moving chunks of data around inside a slice.
In particular, adding elements to the end of a Vec then moving them
somewhere else, as a way to do efficient multiple-insert. (There's
drain for efficient block-remove, but no easy way to block-insert.)
Talk with another example: <https://youtu.be/qH6sSOr-yk8?t=560>
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Closes #38863
Closes #38980
Closes #38903
Closes #36648
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[unstable, deprecated since 1.13.0]
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This change moves:
1. `libcoretest` into `libcore/tests`
2. `libcollectionstest` into `libcollections/tests`
This is a follow-up to #39561.
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