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bors b7583d38b7 Auto merge of #117712 - lcnr:expand-coroutine, r=jackh726 
generator layout: ignore fake borrows

fixes #117059

We emit fake shallow borrows in case the scrutinee place uses a `Deref` and there is a match guard. This is necessary to prevent the match guard from mutating the scrutinee: fab1054e17/compiler/rustc_mir_build/src/build/matches/mod.rs (L1250-L1265)

These fake borrows end up impacting the generator witness computation in `mir_generator_witnesses`, which causes the issue in #117059. This PR now completely ignores fake borrows during this computation. This is sound as thse are always removed after analysis and the actual computation of the generator layout happens afterwards.

Only the second commit impacts behavior, and could be backported by itself.

r? types
2023-11-09 14:23:45 +00:00
..
src Auto merge of #117712 - lcnr:expand-coroutine, r=jackh726 2023-11-09 14:23:45 +00:00
Cargo.toml Clean up rustc_*/Cargo.toml. 2023-10-30 08:46:02 +11:00
messages.ftl Remove cgu_reuse_tracker from Session 2023-10-09 18:39:41 +00:00
README.md mv compiler to compiler/ 2020-08-30 18:45:07 +03:00

README.md

Please read the rustc-dev-guide chapter on Backend Agnostic Codegen.