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Revert "implement TrustedRandomAccess for Take iterator adapter" #85975

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merged 1 commit into from
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@the8472 the8472 commented Jun 3, 2021

This reverts commit 37a5b51 (#83990).

The original change unintentionally caused side-effects from certain iterator chains combining take, zip and next_back() to be omitted which is observable by user code and thus likely a breaking change

Technically one could declare it not a breaking change since Zip's API contract is silent about about its backwards iteration behavior but on the other hand there is nothing in the stable Iterator API that could justify the currently observable behavior. And either way, this impact wasn't noticed or discussed in the original PR.

Fixes #85969

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r? @scottmcm

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@rust-highfive rust-highfive added the S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. label Jun 3, 2021
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the8472 commented Jun 3, 2021

@rustbot label T-libs-impl

@rustbot rustbot added the T-libs Relevant to the library team, which will review and decide on the PR/issue. label Jun 3, 2021
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scottmcm commented Jun 9, 2021

Thanks, @the8472. Sounds reasonable to revert for 1.54 while more conversations happen.

@bors r+ rollup=iffy

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bors commented Jun 9, 2021

📌 Commit dbc43ec has been approved by scottmcm

@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 Jun 9, 2021
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bors commented Jun 9, 2021

⌛ Testing commit dbc43ec with merge 38bc9b9...

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bors commented Jun 9, 2021

☀️ Test successful - checks-actions
Approved by: scottmcm
Pushing 38bc9b9 to master...

@bors bors added the merged-by-bors This PR was explicitly merged by bors. label Jun 9, 2021
@bors bors merged commit 38bc9b9 into rust-lang:master Jun 9, 2021
@rustbot rustbot added this to the 1.54.0 milestone Jun 9, 2021
@wesleywiser wesleywiser added beta-nominated Nominated for backporting to the compiler in the beta channel. beta-accepted Accepted for backporting to the compiler in the beta channel. labels Jun 10, 2021
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Approved for backport

@Mark-Simulacrum Mark-Simulacrum modified the milestones: 1.54.0, 1.53.0 Jun 14, 2021
@Mark-Simulacrum Mark-Simulacrum removed the beta-nominated Nominated for backporting to the compiler in the beta channel. label Jun 14, 2021
bors added a commit to rust-lang-ci/rust that referenced this pull request Jun 15, 2021
…imulacrum

[stable] 1.53.0 release

This includes a backport of:

* Revert "implement TrustedRandomAccess for Take iterator adapter" rust-lang#85975

And includes patches to:

* Update release notes to reflect rust-lang#85541
* Require RUSTC_FORCE_INCREMENTAL to truly enable incremental, fixing rust-lang#86004
* This reverts alignment-related commits to address issue rust-lang#85713 on beta.

r? `@Mark-Simulacrum`
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