bjoernager/rust
bjoernager/rust
1
Fork 0
Code Issues Pull requests Activity

Introduce a no-op PlaceMention statement for let _ =.

Browse source
This commit is contained in:
Camille GILLOT 2022-09-06 18:41:01 +02:00
parent be758ef5ab
commit 4462bb54e3
44 changed files with 139 additions and 20 deletions
Download patch file Download diff file Expand all files Collapse all files

9
compiler/rustc_middle/src/mir/syntax.rs
View file

@ -325,6 +325,15 @@ pub enum StatementKind<'tcx> {
/// Only `RetagKind::Default` and `RetagKind::FnEntry` are permitted.
Retag(RetagKind, Box<Place<'tcx>>),
/// This statement exists to preserve a trace of a scrutinee matched against a wildcard
/// binding. This is especially useful for `let _ = PLACE;` bindings that desugar to a single
/// `PlaceMention(PLACE)`.
///
/// When executed at runtime this is a nop.
///
/// Disallowed after drop elaboration.
PlaceMention(Box<Place<'tcx>>),
/// Encodes a user's type ascription. These need to be preserved
/// intact so that NLL can respect them. For example:
/// ```ignore (illustrative)