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Add comment for the current retag situation

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Jannis Christopher Köhl 2022-10-12 23:46:31 +02:00
parent 5696d06e22
commit aaa35b3e48
1 changed files with 6 additions and 1 deletions
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7
compiler/rustc_mir_dataflow/src/value_analysis.rs
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@ -114,8 +114,13 @@ pub trait ValueAnalysis<'tcx> {
// (A2) // (A2)
state.flood_with(place.as_ref(), self.map(), Self::Value::bottom()); state.flood_with(place.as_ref(), self.map(), Self::Value::bottom());
} }
StatementKind::Retag(..) => {
// A retag modifies the provenance of references. Currently references are only
// tracked if `-Zunsound-mir-opts` is given, but this might change in the future.
// However, it is still unclear how retags should be handled:
// https://github.com/rust-lang/rust/pull/101168#discussion_r985304895
}
StatementKind::Nop StatementKind::Nop
| StatementKind::Retag(..)
| StatementKind::FakeRead(..) | StatementKind::FakeRead(..)
| StatementKind::Coverage(..) | StatementKind::Coverage(..)
| StatementKind::AscribeUserType(..) => (), | StatementKind::AscribeUserType(..) => (),