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Add a useful comment about PromoteTemps.

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This was non-obvious to me.
This commit is contained in:
Nicholas Nethercote 2024-09-04 13:20:20 +10:00
parent e26692d559
commit 51e1c3958d
1 changed files with 1 additions and 0 deletions
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compiler/rustc_mir_transform/src/promote_consts.rs
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@ -36,6 +36,7 @@ use tracing::{debug, instrument};
/// newly created `Constant`. /// newly created `Constant`.
#[derive(Default)] #[derive(Default)]
pub(super) struct PromoteTemps<'tcx> { pub(super) struct PromoteTemps<'tcx> {
// Must use `Cell` because `run_pass` takes `&self`, not `&mut self`.
pub promoted_fragments: Cell<IndexVec<Promoted, Body<'tcx>>>, pub promoted_fragments: Cell<IndexVec<Promoted, Body<'tcx>>>,
} }