interpret: Drop: always evaluate place

Author: RalfJung

compiler/rustc_const_eval/src/interpret/terminator.rs

@@ -169,10 +169,8 @@ impl<'mir, 'tcx: 'mir, M: Machine<'mir, 'tcx>> InterpCx<'mir, 'tcx, M> {
             }
 
             Drop { place, target, unwind, replace: _ } => {
-                let frame = self.frame();
-                let ty = place.ty(&frame.body.local_decls, *self.tcx).ty;
-                let ty = self.instantiate_from_frame_and_normalize_erasing_regions(frame, ty)?;
-                let instance = Instance::resolve_drop_in_place(*self.tcx, ty);
+                let place = self.eval_place(place)?;
+                let instance = Instance::resolve_drop_in_place(*self.tcx, place.layout.ty);
                 if let ty::InstanceDef::DropGlue(_, None) = instance.def {
                     // This is the branch we enter if and only if the dropped type has no drop glue
                     // whatsoever. This can happen as a result of monomorphizing a drop of a
@@ -181,8 +179,7 @@ impl<'mir, 'tcx: 'mir, M: Machine<'mir, 'tcx>> InterpCx<'mir, 'tcx, M> {
                     self.go_to_block(target);
                     return Ok(());
                 }
-                let place = self.eval_place(place)?;
-                trace!("TerminatorKind::drop: {:?}, type {}", place, ty);
+                trace!("TerminatorKind::drop: {:?}, type {}", place, place.layout.ty);
                 self.drop_in_place(&place, instance, target, unwind)?;
             }