2 files changed, 6 insertions, 1 deletions
diff --git a/compiler/rustc_mir_transform/src/gvn.rs b/compiler/rustc_mir_transform/src/gvn.rs
index f867c130efb..bf6aa800d20 100644
--- a/compiler/rustc_mir_transform/src/gvn.rs
+++ b/compiler/rustc_mir_transform/src/gvn.rs
@@ -1644,6 +1644,11 @@ impl<'tcx> VnState<'_, 'tcx> {
                 let place =
                     Place { local, projection: self.tcx.mk_place_elems(projection.as_slice()) };
                 return Some(place);
+            } else if projection.last() == Some(&PlaceElem::Deref) {
+                // `Deref` can only be the first projection in a place.
+                // If we are here, we failed to find a local, and we already have a `Deref`.
+                // Trying to add projections will only result in an ill-formed place.
+                return None;
             } else if let Value::Projection(pointer, proj) = *self.get(index)
                 && (allow_complex_projection || proj.is_stable_offset())
                 && let Some(proj) = self.try_as_place_elem(self.ty(index), proj, loc)
diff --git a/compiler/rustc_mir_transform/src/inline/cycle.rs b/compiler/rustc_mir_transform/src/inline/cycle.rs
index 7f9234d1dc8..25a9baffe58 100644
--- a/compiler/rustc_mir_transform/src/inline/cycle.rs
+++ b/compiler/rustc_mir_transform/src/inline/cycle.rs
@@ -2,9 +2,9 @@ use rustc_data_structures::fx::{FxHashMap, FxHashSet, FxIndexSet};
 use rustc_data_structures::stack::ensure_sufficient_stack;
 use rustc_data_structures::unord::UnordSet;
 use rustc_hir::def_id::{DefId, LocalDefId};
+use rustc_hir::limit::Limit;
 use rustc_middle::mir::TerminatorKind;
 use rustc_middle::ty::{self, GenericArgsRef, InstanceKind, TyCtxt, TypeVisitableExt};
-use rustc_session::Limit;
 use rustc_span::sym;
 use tracing::{instrument, trace};