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Rollup merge of #85404 - pietroalbini:relnotes-1.52.1, r=Mark-Simulacrum

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Backport 1.52.1 release notes

This PR backports the 1.52.1 release notes to master, fixing https://github.com/rust-lang/rust/issues/85235.

r? `@Mark-Simulacrum`
`@rustbot` modify-labels: beta-accepted beta-nominated T-release
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Ralf Jung 2021-05-18 19:35:44 +02:00 • committed by GitHub
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RELEASES.md
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Version 1.52.1 (2021-05-10)
============================
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 the widespread, and frequently occuring, breakage encountered by
Rust users due to newly enabled incremental verification in 1.52.0. Notably,
Rust users **should** upgrade to 1.52.0 or 1.52.1: the bugs that are detected by
newly added incremental verification are still present in past stable versions,
and are not yet fixed on any channel. These bugs can lead to miscompilation of
Rust binaries.
These problems only affect incremental builds, so release builds with Cargo
should not be affected unless the user has explicitly opted into incremental.
Debug and check builds are affected.
See [84970] for more details.
[84970]: https://github.com/rust-lang/rust/issues/84970
Version 1.52.0 (2021-05-06)
============================