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Rust 1.68.1

Released on March 23, 2023

Full Changelog

- Fix miscompilation in produced Windows MSVC artifacts

This was introduced by enabling ThinLTO for the distributed rustc which led

to miscompilations in the resulting binary. Currently this is believed to be

limited to the -Zdylib-lto flag used for rustc compilation, rather than a

general bug in ThinLTO, so only rustc artifacts should be affected.

- Fix --enable-local-rust builds

- Treat $prefix-clang as clang in linker detection code

- Fix panic in compiler code