diff options
Diffstat (limited to 'compiler')
| -rw-r--r-- | compiler/rustc_mir_transform/src/gvn.rs | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/compiler/rustc_mir_transform/src/gvn.rs b/compiler/rustc_mir_transform/src/gvn.rs index 5a13394543b..7f005accc65 100644 --- a/compiler/rustc_mir_transform/src/gvn.rs +++ b/compiler/rustc_mir_transform/src/gvn.rs @@ -1654,6 +1654,11 @@ 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) |