diff options
| -rw-r--r-- | compiler/rustc_middle/src/mir/syntax.rs | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/compiler/rustc_middle/src/mir/syntax.rs b/compiler/rustc_middle/src/mir/syntax.rs index 748ca047754..22a4b688c51 100644 --- a/compiler/rustc_middle/src/mir/syntax.rs +++ b/compiler/rustc_middle/src/mir/syntax.rs @@ -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`. |