mirror
/
rustc-dev-guide
mirror of https://github.com/rust-lang/rustc-dev-guide.git
1
0
Fork 0
Code Issues Packages Projects Releases Wiki Activity

fix permalinks

This commit is contained in:
Michael Goulet 2024-11-01 23:49:19 -04:00 committed by 许杰友 Jieyou Xu (Joe)
parent c21a829aab
commit 30f861c671
1 changed files with 2 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
src/coroutine-closures.md
View File

@ -204,7 +204,7 @@ Well, first of all, all async closures implement `FnOnce` since they can always
For `Fn`/`FnMut`, the detailed answer involves answering a related question: is the coroutine-closure lending? Because if it is, then it cannot implement the non-lending `Fn`/`FnMut` traits.
Determining when the coroutine-closure must *lend* its upvars is implemented in the `should_reborrow_from_env_of_parent_coroutine_closure` helper function[^u1]. Specifically, this needs to happen in two places:
[^u1]: https://github.com/rust-lang/rust/blob/master/compiler/rustc_hir_typeck/src/upvar.rs#L1818-L1860
[^u1]: https://github.com/rust-lang/rust/blob/7c7bb7dc017545db732f5cffec684bbaeae0a9a0/compiler/rustc_hir_typeck/src/upvar.rs#L1818-L1860
1. Are we borrowing data owned by the parent closure? We can determine if that is the case by checking if the parent capture is by-move, EXCEPT if we apply a deref projection, which means we're reborrowing a reference that we captured by-move.
@ -254,4 +254,4 @@ It turns out that borrow-checking async closures is pretty straightforward. Afte
One thing to note is that we don't borrow-check the synthetic body we make for by-move coroutines, since by construction (and the validity of the by-ref coroutine body it was derived from) it must be valid.
[^bck1]: https://github.com/rust-lang/rust/blob/705cfe0e966399e061d64dd3661bfbc57553ed87/compiler/rustc_borrowck/src/universal_regions.rs#L110-L115
[^bck2]: https://github.com/rust-lang/rust/blob/master/compiler/rustc_borrowck/src/universal_regions.rs#L743-L790
[^bck2]: https://github.com/rust-lang/rust/blob/7c7bb7dc017545db732f5cffec684bbaeae0a9a0/compiler/rustc_borrowck/src/universal_regions.rs#L743-L790