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Rollup merge of #129939 - RalfJung:rvalue-len, r=compiler-errors

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explain why Rvalue::Len still exists

I just spent a bit of time trying to remove this until I realized why that's non-trivial. Let's document that for the next person. :)
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Matthias Krüger 2024-09-05 19:43:48 +02:00 committed by GitHub
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compiler/rustc_middle/src/mir/syntax.rs
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@ -1307,6 +1307,9 @@ pub enum Rvalue<'tcx> {
/// If the type of the place is an array, this is the array length. For slices (`[T]`, not
/// `&[T]`) this accesses the place's metadata to determine the length. This rvalue is
/// ill-formed for places of other types.
///
/// This cannot be a `UnOp(PtrMetadata, _)` because that expects a value, and we only
/// have a place, and `UnOp(PtrMetadata, RawPtr(place))` is not a thing.
Len(Place<'tcx>),
/// Performs essentially all of the casts that can be performed via `as`.