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btree_map: Cursor{,Mut}::peek_prev must agree #111238

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workingjubilee
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Our Cursor::peek_prev and CursorMut::peek_prev must agree on how to behave when they are called on the "null element". This will fix #111228.

r? @Amanieu

Our `Cursor::peek_prev` and `CursorMut::peek_prev` must agree
on how to behave when they are called on the "null element".
@rustbot rustbot added S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. T-libs Relevant to the library team, which will review and decide on the PR/issue. labels May 5, 2023
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rustbot commented May 5, 2023

Hey! It looks like you've submitted a new PR for the library teams!

If this PR contains changes to any rust-lang/rust public library APIs then please comment with @rustbot label +T-libs-api -T-libs to tag it appropriately. If this PR contains changes to any unstable APIs please edit the PR description to add a link to the relevant API Change Proposal or create one if you haven't already. If you're unsure where your change falls no worries, just leave it as is and the reviewer will take a look and make a decision to forward on if necessary.

Examples of T-libs-api changes:

  • Stabilizing library features
  • Introducing insta-stable changes such as new implementations of existing stable traits on existing stable types
  • Introducing new or changing existing unstable library APIs (excluding permanently unstable features / features without a tracking issue)
  • Changing public documentation in ways that create new stability guarantees
  • Changing observable runtime behavior of library APIs

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Amanieu commented May 5, 2023

Nice catch! I blame copy & paste.

@bors r+

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bors commented May 5, 2023

📌 Commit 00cb59b has been approved by Amanieu

It is now in the queue for this repository.

@bors bors added S-waiting-on-bors Status: Waiting on bors to run and complete tests. Bors will change the label on completion. and removed S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. labels May 5, 2023
bors added a commit to rust-lang-ci/rust that referenced this pull request May 5, 2023
Rollup of 6 pull requests

Successful merges:

 - rust-lang#103056 (Fix `checked_{add,sub}_duration` incorrectly returning `None` when `other` has more than `i64::MAX` seconds)
 - rust-lang#108801 (Implement RFC 3348, `c"foo"` literals)
 - rust-lang#110773 (Reduce MIR dump file count for MIR-opt tests)
 - rust-lang#110876 (Added default target cpu to `--print target-cpus` output and updated docs)
 - rust-lang#111068 (Improve check-cfg implementation)
 - rust-lang#111238 (btree_map: `Cursor{,Mut}::peek_prev` must agree)

Failed merges:

 - rust-lang#110694 (Implement builtin # syntax and use it for offset_of!(...))

r? `@ghost`
`@rustbot` modify labels: rollup
@bors bors merged commit c99ab29 into rust-lang:master May 5, 2023
@rustbot rustbot added this to the 1.71.0 milestone May 5, 2023
@workingjubilee workingjubilee deleted the fix-btree-cursormut-peek-prev branch July 31, 2023 17:53
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Successfully merging this pull request may close these issues.

Experimental feature "BTreeMap cursors": CursorMut.peek_prev() broken
4 participants