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Tracking Issue for const_btree_len #71835
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A-collectionsArea: `std::collections`Area: `std::collections`A-const-evalArea: Constant evaluation, covers all const contexts (static, const fn, ...)Area: Constant evaluation, covers all const contexts (static, const fn, ...)C-tracking-issueCategory: An issue tracking the progress of sth. like the implementation of an RFCCategory: An issue tracking the progress of sth. like the implementation of an RFCI-libs-radarLibs issues that are tracked on the team's radar.Libs issues that are tracked on the team's radar.S-waiting-on-reviewStatus: Awaiting review from the assignee but also interested parties.Status: Awaiting review from the assignee but also interested parties.T-libsRelevant to the library team, which will review and decide on the PR/issue.Relevant to the library team, which will review and decide on the PR/issue.disposition-mergeThis issue / PR is in PFCP or FCP with a disposition to merge it.This issue / PR is in PFCP or FCP with a disposition to merge it.finished-final-comment-periodThe final comment period is finished for this PR / Issue.The final comment period is finished for this PR / Issue.
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A-collectionsArea: `std::collections`Area: `std::collections`A-const-evalArea: Constant evaluation, covers all const contexts (static, const fn, ...)Area: Constant evaluation, covers all const contexts (static, const fn, ...)C-tracking-issueCategory: An issue tracking the progress of sth. like the implementation of an RFCCategory: An issue tracking the progress of sth. like the implementation of an RFCI-libs-radarLibs issues that are tracked on the team's radar.Libs issues that are tracked on the team's radar.S-waiting-on-reviewStatus: Awaiting review from the assignee but also interested parties.Status: Awaiting review from the assignee but also interested parties.T-libsRelevant to the library team, which will review and decide on the PR/issue.Relevant to the library team, which will review and decide on the PR/issue.disposition-mergeThis issue / PR is in PFCP or FCP with a disposition to merge it.This issue / PR is in PFCP or FCP with a disposition to merge it.finished-final-comment-periodThe final comment period is finished for this PR / Issue.The final comment period is finished for this PR / Issue.
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This tracks stabilization of the
const_btree_lenfeature, which allows calling the below in a constant expression:BTree{Map,Set}::{len,is_empty}()(Constantify more BTreeMap and BTreeSet functions #78581)Previously tracked here, already stable
BTree{Map,Set}::new()(Make BTreeMap::new and BTreeSet::new const #71839)Steps