Recordscargoonce_cell1.21.4OnceLock::get_or_init
Published samples
- 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 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.
| Environment | Confidence | Observations | Verified | Pass rate | Peers | Last seen |
|---|---|---|---|---|---|---|
| rust 1 · Rust · cargo · linux musl · docker
Verified: CONTRACT 1✓
|
LOW | 0 | 1 | 100% | 0 · 1✓ | 2026-08-18 |
snapshot · 2026-09-15
Failure clusters
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observed PROJECT_COMPILE exit 101 E0507 ×1 1.21.4 os=linux sha256:4488bf5be6d6…error[E0507]: cannot move out of static item `FIELD_SET`rust/rustc · compiler-diagnostic · outer cargo runEvidence quality: complete · Environment variants: 1 · First recorded: 2026-09-16 · Last seen: 2026-09-16
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observed PROJECT_COMPILE exit 101 ×1 1.21.4 os=linux sha256:7641f360237b…error: could not compile `sample-tracing-core` (bin <str>) due to 1 previous errorrust/rustc · compiler-diagnostic · outer cargo runEvidence quality: complete · Environment variants: 1 · First recorded: 2026-09-16 · Last seen: 2026-09-16
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observed UNKNOWN exit 101 ERROR Evidence gap ×1 1.21.4 os=linux sha256:7c6fafa6a835…Compiling sample-tracing-core v1.0.0 (<path> · Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.21s · Running `target/debug/contract` …cargo · unclassified-diagnostic · outer cargo run · gap stage-unknownEvidence quality: complete · Environment variants: 1 · First recorded: 2026-09-16 · Last seen: 2026-09-16Diagnostic re-verification candidate
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observed PROJECT_COMPILE exit 101 ×1 1.21.4 os=linux sha256:4d444e9e07b5…error: could not compile `test-wb` (bin <str>) due to 1 previous errorrust/rustc · compiler-diagnostic · outer cargo checkEvidence quality: complete · Environment variants: 1 · First recorded: 2026-09-19 · Last seen: 2026-09-19
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observed PROJECT_COMPILE exit 101 E0599 ×1 1.21.4 os=linux sha256:689d8da7053d…error[E0599]: no method named `http1_only` found for mutable reference `&mut hyper_util::client::legacy::Builder` in the current scoperust/rustc · compiler-diagnostic · outer cargo runEvidence quality: complete · Environment variants: 1 · First recorded: 2026-09-19 · Last seen: 2026-09-19
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observed PROJECT_COMPILE exit 101 E0432 ×1 1.21.4 os=linux sha256:81ff5a6ae827…error[E0432]: unresolved import `wasm_bindgen_macro`rust/rustc · compiler-diagnostic · outer cargo checkEvidence quality: complete · Environment variants: 1 · First recorded: 2026-09-19 · Last seen: 2026-09-19
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observed PROJECT_COMPILE exit 101 E0433 ×1 1.21.4 os=linux sha256:8d7d824b0493…error[E0433]: cannot find module or crate `wasm_bindgen` in this scoperust/rustc · compiler-diagnostic · outer cargo checkEvidence quality: complete · Environment variants: 1 · First recorded: 2026-09-19 · Last seen: 2026-09-19
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observed PROJECT_COMPILE exit 101 ×1 1.21.4 os=linux sha256:a67fd218023f…error: could not compile `test-hyper-util` (bin <str>) due to 1 previous errorrust/rustc · compiler-diagnostic · outer cargo runEvidence quality: complete · Environment variants: 1 · First recorded: 2026-09-19 · Last seen: 2026-09-19
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observed PROJECT_COMPILE exit 101 ×1 1.21.4 os=linux sha256:d0b315730521…error: could not compile `test-macro` (bin <str>) due to 1 previous errorrust/rustc · compiler-diagnostic · outer cargo checkEvidence quality: complete · Environment variants: 1 · First recorded: 2026-09-19 · Last seen: 2026-09-19
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observed UNKNOWN signal ABORTED Evidence gap ×1 1.21.4 os=linux sha256:5650faa5dc98…Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.02s · Running `target/debug/test-js-sys` …cargo · unclassified-diagnostic · outer cargo run · gap stage-unknownEvidence quality: complete · Environment variants: 1 · First recorded: 2026-09-19 · Last seen: 2026-09-19Diagnostic re-verification candidate
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observed UNKNOWN exit 101 Evidence gap ×1 1.21.4 os=linux sha256:7714306cce9e…Compiling unicode-ident v1.0.26 · Compiling cfg-if v1.0.5 · Compiling once_cell v1.21.4 · Compiling proc-macro2 v1.0.107cargo · unclassified-diagnostic · outer cargo run · gap stage-unknownEvidence quality: complete · Environment variants: 1 · First recorded: 2026-09-19 · Last seen: 2026-09-19Diagnostic re-verification candidate
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observed UNKNOWN exit 101 Evidence gap ×1 1.21.4 os=linux sha256:c6c5fb2b7e90…Compiling test_wb v0.1.0 (<path> · Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.18s · Running `target/debug/test_wb` …cargo · unclassified-diagnostic · outer cargo run · gap stage-unknownEvidence quality: complete · Environment variants: 1 · First recorded: 2026-09-19 · Last seen: 2026-09-19Diagnostic re-verification candidate
Showing the 12 most-reported of 18 recorded failure clusters. The rest are single reports.