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Stabilized APIs

These APIs are now usable in const contexts:

Cargo

No feature changes, but see compatibility notes.

Compatibility Notes

Internal Changes

These changes provide no direct user facing benefits, but represent significant improvements to the internals and overall performance of rustc and related tools.

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* Refer to Rust's platform support page for more information on Rust's tiered platform support.

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Cargo

Misc

Compatibility Notes

Internal Changes

These changes provide no direct user facing benefits, but represent significant improvements to the internals and overall performance of rustc and related tools.

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This release disables incremental compilation, unless the user has explicitly opted in via the newly added RUSTC_FORCE_INCREMENTAL=1 environment variable. This is due to a known and relatively frequently occurring bug in incremental compilation, which causes builds to issue internal compiler errors. This particular bug is already fixed on nightly, but that fix has not yet rolled out to stable and is deemed too risky for a direct stable backport.

As always, we encourage users to test with nightly and report bugs so that we can track failures and fix issues earlier.

See 94124 for more details.

Libraries

Stabilized APIs

Const-stable:

Cargo

Compatibility Notes

Internal Changes

These changes provide no direct user facing benefits, but represent significant improvements to the internals and overall performance of rustc and related tools.

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* Refer to Rust's platform support page for more information on Rust's tiered platform support.

Libraries

Stabilized APIs

These APIs are now usable in const contexts:

Cargo

Rustdoc

Compatibility Notes

Internal Changes

These changes provide no direct user facing benefits, but represent significant improvements to the internals and overall performance of rustc and related tools.

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* Refer to Rust's platform support page for more information on Rust's tiered platform support.

Libraries

Stabilised APIs

These APIs are now usable in const contexts:

Cargo

Compatibility notes

Internal changes

These changes provide no direct user facing benefits, but represent significant improvements to the internals and overall performance of rustc and related tools.

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  • New lints to detect the presence of bidirectional-override Unicode codepoints in the compiled source code (CVE-2021-42574)
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* Refer to Rust's platform support page for more information on Rust's tiered platform support.

Libraries

Stabilised APIs

These APIs are now usable in const contexts:

Cargo

Compatibility notes

Internal changes

These changes provide no direct user facing benefits, but represent significant improvements to the internals and overall performance of rustc and related tools.

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* Refer to Rust's platform support page for more information on Rust's tiered platform support.

Libraries

Stabilised APIs

The following previously stable functions are now const.

Cargo

Rustdoc

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* Refer to Rust's platform support page for more information on Rust's tiered platform support.

Libraries

Stabilized APIs

Cargo

Compatibility Notes