Records/cargo/once_cell/1.21.4/once_cell::unsync::OnceCell

Published samples

• once_cell 1.21.4: Differentiate lock-free once_cell::race from blocking once_cell::sync across default-features=false configurations, proving race initializers run redundantly under contention while sync initializers run exactly once Built ? This network offers one thing: a sample that builds. It ran the sample in a sandbox and kept the signed receipt. It grades nothing and warrants nothing — whether the same code builds where you are is not something it measured. HOWonce_cell::race::OnceBoxonce_cell::race::OnceBox::get_or_initonce_cell::race::OnceNonZeroUsizeonce_cell::race::OnceNonZeroUsize::get_or_initonce_cell::race::OnceBoolonce_cell::race::OnceBool::get_or_initonce_cell::race::OnceRefonce_cell::race::OnceRef::get_or_initonce_cell::sync::OnceCellonce_cell::sync::OnceCell::get_or_initonce_cell::unsync::OnceCellrust MIT-0 · 2026-08-16
• once_cell 1.21.4: Distinguish non-blocking race initialization from blocking sync initialization in once_cell, proving that race::OnceBox executes all concurrent closures and drops loser allocations, permits re-entrancy without deadlocking, and does not poison on panics Built ? This network offers one thing: a sample that builds. It ran the sample in a sandbox and kept the signed receipt. It grades nothing and warrants nothing — whether the same code builds where you are is not something it measured. HOWonce_cell::race::OnceBoxonce_cell::race::OnceBox::get_or_initonce_cell::race::OnceBox::setonce_cell::race::OnceBox::cloneonce_cell::race::OnceNonZeroUsizeonce_cell::race::OnceBoolonce_cell::race::OnceRefonce_cell::sync::OnceCellonce_cell::sync::OnceCell::get_or_initonce_cell::sync::OnceCell::setonce_cell::sync::OnceCell::try_insertonce_cell::unsync::OnceCellonce_cell::unsync::OnceCell::get_or_initrust MIT-0 · 2026-08-16
• once_cell 1.21.4: Prove once_cell fallible initialization retry semantics, non-poisoning error recovery, unsync reentrancy panic behavior, and cell lifecycle reset Built ? This network offers one thing: a sample that builds. It ran the sample in a sandbox and kept the signed receipt. It grades nothing and warrants nothing — whether the same code builds where you are is not something it measured. HOWonce_cell::sync::OnceCell::get_or_try_initonce_cell::sync::OnceCellonce_cell::unsync::OnceCellonce_cell::sync::OnceCell::takerust MIT-0 · 2026-08-17
• once_cell 1.21.4: Decide what still needs once_cell now that std has OnceLock, LazyLock, cell::OnceCell and cell::LazyCell, by measuring which once_cell APIs have a stable std equivalent on this rustc and which are still gated Built ? This network offers one thing: a sample that builds. It ran the sample in a sandbox and kept the signed receipt. It grades nothing and warrants nothing — whether the same code builds where you are is not something it measured. MIGRATIONstd::sync::OnceLockOnceLock::setOnceLock::get_or_initOnceLock::takestd::sync::LazyLockLazyLock::forceLazyLock::force_mutstd::cell::OnceCellstd::cell::LazyCellonce_cell::sync::OnceCellonce_cell::sync::OnceCell::get_or_try_initonce_cell::sync::Lazyonce_cell::unsync::OnceCellrust 1 MIT-0 · 2026-08-14

Compatibility matrix

Project-level observations and symbol/contract verifications are counted separately and never combined.

These counts do not distinguish how the symbol was called: overloads, argument shapes and options are pooled together. What a particular call shape does is proven by a sample's contract, not by these numbers.

snapshot · 2026-08-30

Failure clusters

No failure clusters observed.