1 files changed, 2 insertions, 48 deletions

diff --git a/compiler/rustc_mir_transform/src/shim.rs b/compiler/rustc_mir_transform/src/shim.rs
index 34074a84e28..c9771467e49 100644
--- a/compiler/rustc_mir_transform/src/shim.rs
+++ b/compiler/rustc_mir_transform/src/shim.rs
@@ -8,7 +8,6 @@ use rustc_hir::lang_items::LangItem;
 use rustc_index::{Idx, IndexVec};
 use rustc_middle::mir::*;
 use rustc_middle::query::Providers;
-use rustc_middle::ty::adjustment::PointerCoercion;
 use rustc_middle::ty::{
     self, CoroutineArgs, CoroutineArgsExt, EarlyBinder, GenericArgs, Ty, TyCtxt,
 };
@@ -718,12 +717,6 @@ fn build_call_shim<'tcx>(
 
     let def_id = instance.def_id();
 
-    let rpitit_shim = if let ty::InstanceKind::ReifyShim(..) = instance {
-        tcx.return_position_impl_trait_in_trait_shim_data(def_id)
-    } else {
-        None
-    };
-
     let sig = tcx.fn_sig(def_id);
     let sig = sig.map_bound(|sig| tcx.instantiate_bound_regions_with_erased(sig));
 
@@ -779,30 +772,7 @@ fn build_call_shim<'tcx>(
     let mut local_decls = local_decls_for_sig(&sig, span);
     let source_info = SourceInfo::outermost(span);
 
-    let mut destination = Place::return_place();
-    if let Some((rpitit_def_id, fn_args)) = rpitit_shim {
-        let rpitit_args =
-            fn_args.instantiate_identity().extend_to(tcx, rpitit_def_id, |param, _| {
-                match param.kind {
-                    ty::GenericParamDefKind::Lifetime => tcx.lifetimes.re_erased.into(),
-                    ty::GenericParamDefKind::Type { .. }
-                    | ty::GenericParamDefKind::Const { .. } => {
-                        unreachable!("rpitit should have no addition ty/ct")
-                    }
-                }
-            });
-        let dyn_star_ty = Ty::new_dynamic(
-            tcx,
-            tcx.item_bounds_to_existential_predicates(rpitit_def_id, rpitit_args),
-            tcx.lifetimes.re_erased,
-            ty::DynStar,
-        );
-        destination = local_decls.push(local_decls[RETURN_PLACE].clone()).into();
-        local_decls[RETURN_PLACE].ty = dyn_star_ty;
-        let mut inputs_and_output = sig.inputs_and_output.to_vec();
-        *inputs_and_output.last_mut().unwrap() = dyn_star_ty;
-        sig.inputs_and_output = tcx.mk_type_list(&inputs_and_output);
-    }
+    let destination = Place::return_place();
 
     let rcvr_place = || {
         assert!(rcvr_adjustment.is_some());
@@ -921,23 +891,7 @@ fn build_call_shim<'tcx>(
         );
     }
     // BB #1/#2 - return
-    // NOTE: If this is an RPITIT in dyn, we also want to coerce
-    // the return type of the function into a `dyn*`.
-    let stmts = if rpitit_shim.is_some() {
-        vec![Statement {
-            source_info,
-            kind: StatementKind::Assign(Box::new((
-                Place::return_place(),
-                Rvalue::Cast(
-                    CastKind::PointerCoercion(PointerCoercion::DynStar, CoercionSource::Implicit),
-                    Operand::Move(destination),
-                    sig.output(),
-                ),
-            ))),
-        }]
-    } else {
-        vec![]
-    };
+    let stmts = vec![];
     block(&mut blocks, stmts, TerminatorKind::Return, false);
     if let Some(Adjustment::RefMut) = rcvr_adjustment {
         // BB #3 - drop if closure panics