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explain a good reason for why LocalValue does not store the type of the local #118482

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Dec 1, 2023
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explain a good reason for why LocalValue does not store the type of the local #118482

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3 changes: 3 additions & 0 deletions compiler/rustc_const_eval/src/interpret/eval_context.rs
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Expand Up @@ -173,6 +173,9 @@ impl<Prov: Provenance> std::fmt::Debug for LocalState<'_, Prov> {
}

/// Current value of a local variable
///
/// This does not store the type of the local; the type is given by `body.local_decls` and can never
/// change, so by not storing here we avoid having to maintain that as an invariant.
#[derive(Copy, Clone, Debug)] // Miri debug-prints these
pub(super) enum LocalValue<Prov: Provenance = AllocId> {
/// This local is not currently alive, and cannot be used at all.
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