nordic-dev.net/rust
nordic-dev.net/rust
2
0
Fork 0
mirror of https://github.com/rust-lang/rust.git synced 2025-05-14 02:49:40 +00:00
Code Issues Packages Projects Releases Wiki Activity

Update ProjectionElem::Downcast documentation

Browse Source 
`ProjectionElem:::Downcast` is used when downcasting to a variant of
an enum or a generator, regardless of the number of variants.
This commit is contained in:
Tomasz Miąsko 2022-05-03 00:00:00 +00:00
parent 086bf7a8ff
commit a63d414031
2 changed files with 2 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
compiler/rustc_middle/src/mir/mod.rs
View File

@ -2017,9 +2017,7 @@ pub enum ProjectionElem<V, T> {
from_end: bool, from_end: bool,
}, },
/// "Downcast" to a variant of an ADT. Currently, we only introduce /// "Downcast" to a variant of an enum or a generator.
/// this for ADTs with more than one variant. It may be better to
/// just introduce it always, or always for enums.
/// ///
/// The included Symbol is the name of the variant, used for printing MIR. /// The included Symbol is the name of the variant, used for printing MIR.
Downcast(Option<Symbol>, VariantIdx), Downcast(Option<Symbol>, VariantIdx),

2
compiler/rustc_middle/src/mir/tcx.rs
View File

@ -12,7 +12,7 @@ use rustc_target::abi::VariantIdx;
#[derive(Copy, Clone, Debug, TypeFoldable)] #[derive(Copy, Clone, Debug, TypeFoldable)]
pub struct PlaceTy<'tcx> { pub struct PlaceTy<'tcx> {
pub ty: Ty<'tcx>, pub ty: Ty<'tcx>,
/// Downcast to a particular variant of an enum, if included. /// Downcast to a particular variant of an enum or a generator, if included.
pub variant_index: Option<VariantIdx>, pub variant_index: Option<VariantIdx>,
} }