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Upgrading once_cell 0.2 to 1

Breaking0.2.4 → 1.21.4Breaking6Security1Platform7Deprecated1New22Changed11Fixed12Other10

Full comparisonBack to once_cell
BreakingUpgrade verdict

6 breaking changes and 7 platform requirement changes and a security fix.

In plain terms
  • Remove portable_atomic from Cargo.lock if it is not, in fact, used: This is a work-around for this cargo bug.
  • The `race` module is now only available when the `race` feature is turned on. It is on by default, but if you disable default features you must enable `race` yourself.
  • The parking_lot feature is no longer enabled by default, so users who relied on it must enable it explicitly.
  • The crate now has a std feature that is on by default. If you turn it off, only the unsync module works.
Must act Top 5 of 15 that need code or config changes

Requires Rust 1.65 from 1.21.1 (none stated before).

What you must change

Breaking6
Remove portable_atomic from Cargo.lock if it is not, in fact, used: This is a work-around for this cargo bug.
portable_atomic
1.20.2CHANGELOG.mdOriginalView source
Hides the race module behind a new default race feature, breaking users who enable no_default_features.
race
1.7.0CHANGELOG.mdSummarizedView source
Removes parking_lot from the list of default features.
parking_lot
1.0.0CHANGELOG.mdSummarizedView source
Adds a std default feature; without std, only the unsync module is supported.
stdunsync
1.0.0CHANGELOG.mdSummarizedView source
Changes the unstable OnceBox API to use Box<T>.
OnceBoxBox<T>
1.5.2CHANGELOG.mdSummarizedView source
Lazy now requires only FnOnce instead of Fn.
LazyFnOnceFn
0.2.5CHANGELOG.mdSummarizedView source
Security1
Panic during initialization of Lazy<T> might trigger undefined behavior
High · CVSS 7.5
1.0.1GitHub AdvisoryOriginalView source
Platform7
Reduce MSRV to 1.65.
1.21.1CHANGELOG.mdOriginalView source
Increase MSRV to 1.70.
1.21.0CHANGELOG.mdOriginalView source
Updates MSRV to 1.60.0 to use dep: syntax for cargo features, removing implementation details from the public surface.
MSRV
1.18.0CHANGELOG.mdSummarizedView source
Increases the minimum supported Rust version to 1.56.0.
1.15.0CHANGELOG.mdSummarizedView source
Upgrades parking_lot to 0.12.0, which bumps the MSRV to 1.49.0 when the parking_lot feature is enabled.
parking_lot
1.10.0CHANGELOG.mdSummarizedView source
Increases the minimum supported Rust version (MSRV) to 1.36.0.
1.5.1CHANGELOG.mdSummarizedView source
Upgrades parking_lot to 0.10, which bumps the MSRV to 1.36.0 when the parking_lot feature is enabled.
parking_lot
1.4.0CHANGELOG.mdSummarizedView source

Deprecations to plan for

Deprecated1
Deprecates the atomic-polyfill feature in favor of the new critical-section feature.
atomic-polyfillcritical-section
1.16.0CHANGELOG.mdSummarizedView source