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clarify semantics of ConstantIndex MIR projection #131285

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Oct 5, 2024
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clarify semantics of ConstantIndex MIR projection #131285

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6 changes: 4 additions & 2 deletions compiler/rustc_middle/src/mir/syntax.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -1135,8 +1135,10 @@ pub enum ProjectionElem<V, T> {
ConstantIndex {
/// index or -index (in Python terms), depending on from_end
offset: u64,
/// The thing being indexed must be at least this long. For arrays this
/// is always the exact length.
/// The thing being indexed must be at least this long -- otherwise, the
/// projection is UB.
///
/// For arrays this is always the exact length.
min_length: u64,
/// Counting backwards from end? This is always false when indexing an
/// array.
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6 changes: 4 additions & 2 deletions compiler/stable_mir/src/mir/body.rs
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Expand Up @@ -768,8 +768,10 @@ pub enum ProjectionElem {
ConstantIndex {
/// index or -index (in Python terms), depending on from_end
offset: u64,
/// The thing being indexed must be at least this long. For arrays this
/// is always the exact length.
/// The thing being indexed must be at least this long -- otherwise, the
/// projection is UB.
///
/// For arrays this is always the exact length.
min_length: u64,
/// Counting backwards from end? This is always false when indexing an
/// array.
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