diff --git a/Cargo.lock b/Cargo.lock
index 82530c019a91c..47bf654c8f4ef 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -4669,15 +4669,9 @@ dependencies = [
 name = "rustc_smir"
 version = "0.0.0"
 dependencies = [
- "rustc_borrowck",
- "rustc_driver",
- "rustc_hir",
- "rustc_interface",
  "rustc_middle",
- "rustc_mir_dataflow",
- "rustc_mir_transform",
- "rustc_serialize",
- "rustc_trait_selection",
+ "rustc_span",
+ "tracing",
 ]
 
 [[package]]
diff --git a/RELEASES.md b/RELEASES.md
index f418ab23d10af..4e974bbe9747e 100644
--- a/RELEASES.md
+++ b/RELEASES.md
@@ -3861,6 +3861,8 @@ Version 1.41.1 (2020-02-27)
 * [Always check types of static items][69145]
 * [Always check lifetime bounds of `Copy` impls][69145]
 * [Fix miscompilation in callers of `Layout::repeat`][69225]
+* [Rust 1.41.0 was announced as the last Rust release with tier 1 or tier 2 support for 32-bit Apple targets][apple-32bit-drop].
+  That announcement did not expect a patch release. 1.41.1 also includes release binaries for these targets.
 
 [69225]: https://github.com/rust-lang/rust/issues/69225
 [69145]: https://github.com/rust-lang/rust/pull/69145
@@ -3953,7 +3955,7 @@ Misc
 Compatibility Notes
 -------------------
 
-- [As previously announced 1.41.0 will be the last tier 1 release for 32-bit
+- [As previously announced 1.41 will be the last tier 1 release for 32-bit
   Apple targets.][apple-32bit-drop] This means that the source code is still
   available to build, but the targets are no longer being tested and release
   binaries for those platforms will no longer be distributed by the Rust project.
diff --git a/compiler/rustc_borrowck/src/invalidation.rs b/compiler/rustc_borrowck/src/invalidation.rs
index 6217676d5c150..1006a047cce09 100644
--- a/compiler/rustc_borrowck/src/invalidation.rs
+++ b/compiler/rustc_borrowck/src/invalidation.rs
@@ -118,15 +118,6 @@ impl<'cx, 'tcx> Visitor<'tcx> for InvalidationGenerator<'cx, 'tcx> {
                     LocalMutationIsAllowed::Yes,
                 );
             }
-            TerminatorKind::DropAndReplace {
-                place: drop_place,
-                value: new_value,
-                target: _,
-                unwind: _,
-            } => {
-                self.mutate_place(location, *drop_place, Deep);
-                self.consume_operand(location, new_value);
-            }
             TerminatorKind::Call {
                 func,
                 args,
diff --git a/compiler/rustc_borrowck/src/lib.rs b/compiler/rustc_borrowck/src/lib.rs
index 0fc3240c56004..92acd7555095e 100644
--- a/compiler/rustc_borrowck/src/lib.rs
+++ b/compiler/rustc_borrowck/src/lib.rs
@@ -743,15 +743,6 @@ impl<'cx, 'tcx> rustc_mir_dataflow::ResultsVisitor<'cx, 'tcx> for MirBorrowckCtx
                     flow_state,
                 );
             }
-            TerminatorKind::DropAndReplace {
-                place: drop_place,
-                value: new_value,
-                target: _,
-                unwind: _,
-            } => {
-                self.mutate_place(loc, (*drop_place, span), Deep, flow_state);
-                self.consume_operand(loc, (new_value, span), flow_state);
-            }
             TerminatorKind::Call {
                 func,
                 args,
@@ -866,7 +857,6 @@ impl<'cx, 'tcx> rustc_mir_dataflow::ResultsVisitor<'cx, 'tcx> for MirBorrowckCtx
             | TerminatorKind::Assert { .. }
             | TerminatorKind::Call { .. }
             | TerminatorKind::Drop { .. }
-            | TerminatorKind::DropAndReplace { .. }
             | TerminatorKind::FalseEdge { real_target: _, imaginary_target: _ }
             | TerminatorKind::FalseUnwind { real_target: _, unwind: _ }
             | TerminatorKind::Goto { .. }
diff --git a/compiler/rustc_borrowck/src/type_check/liveness/trace.rs b/compiler/rustc_borrowck/src/type_check/liveness/trace.rs
index a687d3f535243..9731b10aa99d9 100644
--- a/compiler/rustc_borrowck/src/type_check/liveness/trace.rs
+++ b/compiler/rustc_borrowck/src/type_check/liveness/trace.rs
@@ -435,8 +435,7 @@ impl<'me, 'typeck, 'flow, 'tcx> LivenessResults<'me, 'typeck, 'flow, 'tcx> {
         //
         // What we *actually* generate is a store to a temporary
         // for the call (`TMP = call()...`) and then a
-        // `DropAndReplace` to swap that with `X`
-        // (`DropAndReplace` has very particular semantics).
+        // `Drop(X)` followed by `X = TMP`  to swap that with `X`.
     }
 }
 
diff --git a/compiler/rustc_borrowck/src/type_check/mod.rs b/compiler/rustc_borrowck/src/type_check/mod.rs
index 06c7b8b8f8731..d85e058bb208f 100644
--- a/compiler/rustc_borrowck/src/type_check/mod.rs
+++ b/compiler/rustc_borrowck/src/type_check/mod.rs
@@ -1312,24 +1312,6 @@ impl<'a, 'tcx> TypeChecker<'a, 'tcx> {
                 // no checks needed for these
             }
 
-            TerminatorKind::DropAndReplace { place, value, target: _, unwind: _ } => {
-                let place_ty = place.ty(body, tcx).ty;
-                let rv_ty = value.ty(body, tcx);
-
-                let locations = term_location.to_locations();
-                if let Err(terr) =
-                    self.sub_types(rv_ty, place_ty, locations, ConstraintCategory::Assignment)
-                {
-                    span_mirbug!(
-                        self,
-                        term,
-                        "bad DropAndReplace ({:?} = {:?}): {:?}",
-                        place_ty,
-                        rv_ty,
-                        terr
-                    );
-                }
-            }
             TerminatorKind::SwitchInt { discr, .. } => {
                 self.check_operand(discr, term_location);
 
@@ -1629,7 +1611,6 @@ impl<'a, 'tcx> TypeChecker<'a, 'tcx> {
             }
             TerminatorKind::Unreachable => {}
             TerminatorKind::Drop { target, unwind, .. }
-            | TerminatorKind::DropAndReplace { target, unwind, .. }
             | TerminatorKind::Assert { target, cleanup: unwind, .. } => {
                 self.assert_iscleanup(body, block_data, target, is_cleanup);
                 if let Some(unwind) = unwind {
diff --git a/compiler/rustc_borrowck/src/used_muts.rs b/compiler/rustc_borrowck/src/used_muts.rs
index 18dbe24d3b8b2..c5991e0bc254e 100644
--- a/compiler/rustc_borrowck/src/used_muts.rs
+++ b/compiler/rustc_borrowck/src/used_muts.rs
@@ -71,9 +71,6 @@ impl<'visit, 'cx, 'tcx> Visitor<'tcx> for GatherUsedMutsVisitor<'visit, 'cx, 'tc
             TerminatorKind::Call { destination, .. } => {
                 self.remove_never_initialized_mut_locals(*destination);
             }
-            TerminatorKind::DropAndReplace { place, .. } => {
-                self.remove_never_initialized_mut_locals(*place);
-            }
             _ => {}
         }
 
diff --git a/compiler/rustc_codegen_cranelift/src/base.rs b/compiler/rustc_codegen_cranelift/src/base.rs
index 7f857528c7c5c..cb0e272cedaba 100644
--- a/compiler/rustc_codegen_cranelift/src/base.rs
+++ b/compiler/rustc_codegen_cranelift/src/base.rs
@@ -499,7 +499,6 @@ fn codegen_fn_body(fx: &mut FunctionCx<'_, '_, '_>, start_block: Block) {
             TerminatorKind::Yield { .. }
             | TerminatorKind::FalseEdge { .. }
             | TerminatorKind::FalseUnwind { .. }
-            | TerminatorKind::DropAndReplace { .. }
             | TerminatorKind::GeneratorDrop => {
                 bug!("shouldn't exist at codegen {:?}", bb_data.terminator());
             }
diff --git a/compiler/rustc_codegen_cranelift/src/constant.rs b/compiler/rustc_codegen_cranelift/src/constant.rs
index 49c4f1aaaefc6..1930db72ead44 100644
--- a/compiler/rustc_codegen_cranelift/src/constant.rs
+++ b/compiler/rustc_codegen_cranelift/src/constant.rs
@@ -543,8 +543,7 @@ pub(crate) fn mir_operand_get_const_val<'tcx>(
                     | TerminatorKind::Unreachable
                     | TerminatorKind::Drop { .. }
                     | TerminatorKind::Assert { .. } => {}
-                    TerminatorKind::DropAndReplace { .. }
-                    | TerminatorKind::Yield { .. }
+                    TerminatorKind::Yield { .. }
                     | TerminatorKind::GeneratorDrop
                     | TerminatorKind::FalseEdge { .. }
                     | TerminatorKind::FalseUnwind { .. } => unreachable!(),
diff --git a/compiler/rustc_codegen_ssa/src/mir/analyze.rs b/compiler/rustc_codegen_ssa/src/mir/analyze.rs
index 95aad10fdb0f9..0ce395e912db3 100644
--- a/compiler/rustc_codegen_ssa/src/mir/analyze.rs
+++ b/compiler/rustc_codegen_ssa/src/mir/analyze.rs
@@ -295,7 +295,6 @@ pub fn cleanup_kinds(mir: &mir::Body<'_>) -> IndexVec<mir::BasicBlock, CleanupKi
                 TerminatorKind::Call { cleanup: unwind, .. }
                 | TerminatorKind::InlineAsm { cleanup: unwind, .. }
                 | TerminatorKind::Assert { cleanup: unwind, .. }
-                | TerminatorKind::DropAndReplace { unwind, .. }
                 | TerminatorKind::Drop { unwind, .. } => {
                     if let Some(unwind) = unwind {
                         debug!(
diff --git a/compiler/rustc_codegen_ssa/src/mir/block.rs b/compiler/rustc_codegen_ssa/src/mir/block.rs
index 57a19a4ab1eab..71c71d59b7ab9 100644
--- a/compiler/rustc_codegen_ssa/src/mir/block.rs
+++ b/compiler/rustc_codegen_ssa/src/mir/block.rs
@@ -1305,10 +1305,6 @@ impl<'a, 'tcx, Bx: BuilderMethods<'a, 'tcx>> FunctionCx<'a, 'tcx, Bx> {
                     mergeable_succ(),
                 ),
 
-            mir::TerminatorKind::DropAndReplace { .. } => {
-                bug!("undesugared DropAndReplace in codegen: {:?}", terminator);
-            }
-
             mir::TerminatorKind::Call {
                 ref func,
                 ref args,
diff --git a/compiler/rustc_const_eval/src/interpret/terminator.rs b/compiler/rustc_const_eval/src/interpret/terminator.rs
index 2aea7c79b6d3e..685a5599cdedf 100644
--- a/compiler/rustc_const_eval/src/interpret/terminator.rs
+++ b/compiler/rustc_const_eval/src/interpret/terminator.rs
@@ -171,11 +171,7 @@ impl<'mir, 'tcx: 'mir, M: Machine<'mir, 'tcx>> InterpCx<'mir, 'tcx, M> {
             Unreachable => throw_ub!(Unreachable),
 
             // These should never occur for MIR we actually run.
-            DropAndReplace { .. }
-            | FalseEdge { .. }
-            | FalseUnwind { .. }
-            | Yield { .. }
-            | GeneratorDrop => span_bug!(
+            FalseEdge { .. } | FalseUnwind { .. } | Yield { .. } | GeneratorDrop => span_bug!(
                 terminator.source_info.span,
                 "{:#?} should have been eliminated by MIR pass",
                 terminator.kind
diff --git a/compiler/rustc_const_eval/src/transform/check_consts/check.rs b/compiler/rustc_const_eval/src/transform/check_consts/check.rs
index cc3aa84bd7170..656baa784d777 100644
--- a/compiler/rustc_const_eval/src/transform/check_consts/check.rs
+++ b/compiler/rustc_const_eval/src/transform/check_consts/check.rs
@@ -985,8 +985,7 @@ impl<'tcx> Visitor<'tcx> for Checker<'_, 'tcx> {
 
             // Forbid all `Drop` terminators unless the place being dropped is a local with no
             // projections that cannot be `NeedsNonConstDrop`.
-            TerminatorKind::Drop { place: dropped_place, .. }
-            | TerminatorKind::DropAndReplace { place: dropped_place, .. } => {
+            TerminatorKind::Drop { place: dropped_place, .. } => {
                 // If we are checking live drops after drop-elaboration, don't emit duplicate
                 // errors here.
                 if super::post_drop_elaboration::checking_enabled(self.ccx) {
diff --git a/compiler/rustc_const_eval/src/transform/check_consts/post_drop_elaboration.rs b/compiler/rustc_const_eval/src/transform/check_consts/post_drop_elaboration.rs
index cf4e875c91f0b..43806035a44a0 100644
--- a/compiler/rustc_const_eval/src/transform/check_consts/post_drop_elaboration.rs
+++ b/compiler/rustc_const_eval/src/transform/check_consts/post_drop_elaboration.rs
@@ -80,8 +80,7 @@ impl<'tcx> Visitor<'tcx> for CheckLiveDrops<'_, 'tcx> {
         trace!("visit_terminator: terminator={:?} location={:?}", terminator, location);
 
         match &terminator.kind {
-            mir::TerminatorKind::Drop { place: dropped_place, .. }
-            | mir::TerminatorKind::DropAndReplace { place: dropped_place, .. } => {
+            mir::TerminatorKind::Drop { place: dropped_place, .. } => {
                 let dropped_ty = dropped_place.ty(self.body, self.tcx).ty;
                 if !NeedsNonConstDrop::in_any_value_of_ty(self.ccx, dropped_ty) {
                     // Instead of throwing a bug, we just return here. This is because we have to
diff --git a/compiler/rustc_const_eval/src/transform/check_consts/resolver.rs b/compiler/rustc_const_eval/src/transform/check_consts/resolver.rs
index 805e6096b35c8..78c74e1892dc5 100644
--- a/compiler/rustc_const_eval/src/transform/check_consts/resolver.rs
+++ b/compiler/rustc_const_eval/src/transform/check_consts/resolver.rs
@@ -222,23 +222,8 @@ where
         // The effect of assignment to the return place in `TerminatorKind::Call` is not applied
         // here; that occurs in `apply_call_return_effect`.
 
-        if let mir::TerminatorKind::DropAndReplace { value, place, .. } = &terminator.kind {
-            let qualif = qualifs::in_operand::<Q, _>(
-                self.ccx,
-                &mut |l| self.state.qualif.contains(l),
-                value,
-            );
-
-            if !place.is_indirect() {
-                self.assign_qualif_direct(place, qualif);
-            }
-        }
-
         // We ignore borrow on drop because custom drop impls are not allowed in consts.
         // FIXME: Reconsider if accounting for borrows in drops is necessary for const drop.
-
-        // We need to assign qualifs to the dropped location before visiting the operand that
-        // replaces it since qualifs can be cleared on move.
         self.super_terminator(terminator, location);
     }
 }
diff --git a/compiler/rustc_const_eval/src/transform/validate.rs b/compiler/rustc_const_eval/src/transform/validate.rs
index 272fe3d1b3109..8ecd8f639ddd4 100644
--- a/compiler/rustc_const_eval/src/transform/validate.rs
+++ b/compiler/rustc_const_eval/src/transform/validate.rs
@@ -846,18 +846,6 @@ impl<'a, 'tcx> Visitor<'tcx> for TypeChecker<'a, 'tcx> {
                     self.check_edge(location, *unwind, EdgeKind::Unwind);
                 }
             }
-            TerminatorKind::DropAndReplace { target, unwind, .. } => {
-                if self.mir_phase >= MirPhase::Runtime(RuntimePhase::Initial) {
-                    self.fail(
-                        location,
-                        "`DropAndReplace` should have been removed during drop elaboration",
-                    );
-                }
-                self.check_edge(location, *target, EdgeKind::Normal);
-                if let Some(unwind) = unwind {
-                    self.check_edge(location, *unwind, EdgeKind::Unwind);
-                }
-            }
             TerminatorKind::Call { func, args, destination, target, cleanup, .. } => {
                 let func_ty = func.ty(&self.body.local_decls, self.tcx);
                 match func_ty.kind() {
diff --git a/compiler/rustc_middle/src/mir/spanview.rs b/compiler/rustc_middle/src/mir/spanview.rs
index 28a3b51b7fc92..e52610faf5af7 100644
--- a/compiler/rustc_middle/src/mir/spanview.rs
+++ b/compiler/rustc_middle/src/mir/spanview.rs
@@ -265,7 +265,6 @@ pub fn terminator_kind_name(term: &Terminator<'_>) -> &'static str {
         Return => "Return",
         Unreachable => "Unreachable",
         Drop { .. } => "Drop",
-        DropAndReplace { .. } => "DropAndReplace",
         Call { .. } => "Call",
         Assert { .. } => "Assert",
         Yield { .. } => "Yield",
diff --git a/compiler/rustc_middle/src/mir/syntax.rs b/compiler/rustc_middle/src/mir/syntax.rs
index ae09562a85e98..58c060db66003 100644
--- a/compiler/rustc_middle/src/mir/syntax.rs
+++ b/compiler/rustc_middle/src/mir/syntax.rs
@@ -133,7 +133,6 @@ pub enum AnalysisPhase {
 pub enum RuntimePhase {
     /// In addition to the semantic changes, beginning with this phase, the following variants are
     /// disallowed:
-    /// * [`TerminatorKind::DropAndReplace`]
     /// * [`TerminatorKind::Yield`]
     /// * [`TerminatorKind::GeneratorDrop`]
     /// * [`Rvalue::Aggregate`] for any `AggregateKind` except `Array`
@@ -596,43 +595,6 @@ pub enum TerminatorKind<'tcx> {
     /// > consider indirect assignments.
     Drop { place: Place<'tcx>, target: BasicBlock, unwind: Option<BasicBlock> },
 
-    /// Drops the place and assigns a new value to it.
-    ///
-    /// This first performs the exact same operation as the pre drop-elaboration `Drop` terminator;
-    /// it then additionally assigns the `value` to the `place` as if by an assignment statement.
-    /// This assignment occurs both in the unwind and the regular code paths. The semantics are best
-    /// explained by the elaboration:
-    ///
-    /// ```ignore (MIR)
-    /// BB0 {
-    ///   DropAndReplace(P <- V, goto BB1, unwind BB2)
-    /// }
-    /// ```
-    ///
-    /// becomes
-    ///
-    /// ```ignore (MIR)
-    /// BB0 {
-    ///   Drop(P, goto BB1, unwind BB2)
-    /// }
-    /// BB1 {
-    ///   // P is now uninitialized
-    ///   P <- V
-    /// }
-    /// BB2 {
-    ///   // P is now uninitialized -- its dtor panicked
-    ///   P <- V
-    /// }
-    /// ```
-    ///
-    /// Disallowed after drop elaboration.
-    DropAndReplace {
-        place: Place<'tcx>,
-        value: Operand<'tcx>,
-        target: BasicBlock,
-        unwind: Option<BasicBlock>,
-    },
-
     /// Roughly speaking, evaluates the `func` operand and the arguments, and starts execution of
     /// the referred to function. The operand types must match the argument types of the function.
     /// The return place type must match the return type. The type of the `func` operand must be
diff --git a/compiler/rustc_middle/src/mir/terminator.rs b/compiler/rustc_middle/src/mir/terminator.rs
index 6e905224c1336..cd970270727f9 100644
--- a/compiler/rustc_middle/src/mir/terminator.rs
+++ b/compiler/rustc_middle/src/mir/terminator.rs
@@ -148,7 +148,6 @@ impl<'tcx> TerminatorKind<'tcx> {
             | Call { target: None, cleanup: Some(t), .. }
             | Call { target: Some(t), cleanup: None, .. }
             | Yield { resume: t, drop: None, .. }
-            | DropAndReplace { target: t, unwind: None, .. }
             | Drop { target: t, unwind: None, .. }
             | Assert { target: t, cleanup: None, .. }
             | FalseUnwind { real_target: t, unwind: None }
@@ -158,7 +157,6 @@ impl<'tcx> TerminatorKind<'tcx> {
             }
             Call { target: Some(t), cleanup: Some(ref u), .. }
             | Yield { resume: t, drop: Some(ref u), .. }
-            | DropAndReplace { target: t, unwind: Some(ref u), .. }
             | Drop { target: t, unwind: Some(ref u), .. }
             | Assert { target: t, cleanup: Some(ref u), .. }
             | FalseUnwind { real_target: t, unwind: Some(ref u) }
@@ -188,7 +186,6 @@ impl<'tcx> TerminatorKind<'tcx> {
             | Call { target: None, cleanup: Some(ref mut t), .. }
             | Call { target: Some(ref mut t), cleanup: None, .. }
             | Yield { resume: ref mut t, drop: None, .. }
-            | DropAndReplace { target: ref mut t, unwind: None, .. }
             | Drop { target: ref mut t, unwind: None, .. }
             | Assert { target: ref mut t, cleanup: None, .. }
             | FalseUnwind { real_target: ref mut t, unwind: None }
@@ -198,7 +195,6 @@ impl<'tcx> TerminatorKind<'tcx> {
             }
             Call { target: Some(ref mut t), cleanup: Some(ref mut u), .. }
             | Yield { resume: ref mut t, drop: Some(ref mut u), .. }
-            | DropAndReplace { target: ref mut t, unwind: Some(ref mut u), .. }
             | Drop { target: ref mut t, unwind: Some(ref mut u), .. }
             | Assert { target: ref mut t, cleanup: Some(ref mut u), .. }
             | FalseUnwind { real_target: ref mut t, unwind: Some(ref mut u) }
@@ -225,7 +221,6 @@ impl<'tcx> TerminatorKind<'tcx> {
             | TerminatorKind::FalseEdge { .. } => None,
             TerminatorKind::Call { cleanup: ref unwind, .. }
             | TerminatorKind::Assert { cleanup: ref unwind, .. }
-            | TerminatorKind::DropAndReplace { ref unwind, .. }
             | TerminatorKind::Drop { ref unwind, .. }
             | TerminatorKind::FalseUnwind { ref unwind, .. }
             | TerminatorKind::InlineAsm { cleanup: ref unwind, .. } => Some(unwind),
@@ -245,7 +240,6 @@ impl<'tcx> TerminatorKind<'tcx> {
             | TerminatorKind::FalseEdge { .. } => None,
             TerminatorKind::Call { cleanup: ref mut unwind, .. }
             | TerminatorKind::Assert { cleanup: ref mut unwind, .. }
-            | TerminatorKind::DropAndReplace { ref mut unwind, .. }
             | TerminatorKind::Drop { ref mut unwind, .. }
             | TerminatorKind::FalseUnwind { ref mut unwind, .. }
             | TerminatorKind::InlineAsm { cleanup: ref mut unwind, .. } => Some(unwind),
@@ -309,9 +303,6 @@ impl<'tcx> TerminatorKind<'tcx> {
             Yield { value, resume_arg, .. } => write!(fmt, "{:?} = yield({:?})", resume_arg, value),
             Unreachable => write!(fmt, "unreachable"),
             Drop { place, .. } => write!(fmt, "drop({:?})", place),
-            DropAndReplace { place, value, .. } => {
-                write!(fmt, "replace({:?} <- {:?})", place, value)
-            }
             Call { func, args, destination, .. } => {
                 write!(fmt, "{:?} = ", destination)?;
                 write!(fmt, "{:?}(", func)?;
@@ -403,10 +394,10 @@ impl<'tcx> TerminatorKind<'tcx> {
             Call { target: None, cleanup: None, .. } => vec![],
             Yield { drop: Some(_), .. } => vec!["resume".into(), "drop".into()],
             Yield { drop: None, .. } => vec!["resume".into()],
-            DropAndReplace { unwind: None, .. } | Drop { unwind: None, .. } => {
+            Drop { unwind: None, .. } => {
                 vec!["return".into()]
             }
-            DropAndReplace { unwind: Some(_), .. } | Drop { unwind: Some(_), .. } => {
+            Drop { unwind: Some(_), .. } => {
                 vec!["return".into(), "unwind".into()]
             }
             Assert { cleanup: None, .. } => vec!["".into()],
diff --git a/compiler/rustc_middle/src/mir/visit.rs b/compiler/rustc_middle/src/mir/visit.rs
index 5c056b29975c4..14b18618aa8d8 100644
--- a/compiler/rustc_middle/src/mir/visit.rs
+++ b/compiler/rustc_middle/src/mir/visit.rs
@@ -495,20 +495,6 @@ macro_rules! make_mir_visitor {
                         );
                     }
 
-                    TerminatorKind::DropAndReplace {
-                        place,
-                        value,
-                        target: _,
-                        unwind: _,
-                    } => {
-                        self.visit_place(
-                            place,
-                            PlaceContext::MutatingUse(MutatingUseContext::Drop),
-                            location
-                        );
-                        self.visit_operand(value, location);
-                    }
-
                     TerminatorKind::Call {
                         func,
                         args,
diff --git a/compiler/rustc_middle/src/ty/query.rs b/compiler/rustc_middle/src/ty/query.rs
index 2bc51baf87905..9d41e4af959c7 100644
--- a/compiler/rustc_middle/src/ty/query.rs
+++ b/compiler/rustc_middle/src/ty/query.rs
@@ -250,6 +250,36 @@ macro_rules! define_callbacks {
             )*
         }
 
+        $(
+            // Ensure that keys grow no larger than 64 bytes
+            #[cfg(all(target_arch = "x86_64", target_pointer_width = "64"))]
+            const _: () = {
+                if mem::size_of::<query_keys::$name<'static>>() > 64 {
+                    panic!("{}", concat!(
+                        "the query `",
+                        stringify!($name),
+                        "` has a key type `",
+                        stringify!($($K)*),
+                        "` that is too large"
+                    ));
+                }
+            };
+
+            // Ensure that values grow no larger than 64 bytes
+            #[cfg(all(target_arch = "x86_64", target_pointer_width = "64"))]
+            const _: () = {
+                if mem::size_of::<query_values::$name<'static>>() > 64 {
+                    panic!("{}", concat!(
+                        "the query `",
+                        stringify!($name),
+                        "` has a value type `",
+                        stringify!($V),
+                        "` that is too large"
+                    ));
+                }
+            };
+        )*
+
         pub struct QueryArenas<'tcx> {
             $($(#[$attr])* pub $name: query_if_arena!([$($modifiers)*]
                 (WorkerLocal<TypedArena<<$V as Deref>::Target>>)
diff --git a/compiler/rustc_mir_build/src/build/custom/parse/instruction.rs b/compiler/rustc_mir_build/src/build/custom/parse/instruction.rs
index 09d2eb96d0f16..5e77f2dc1268d 100644
--- a/compiler/rustc_mir_build/src/build/custom/parse/instruction.rs
+++ b/compiler/rustc_mir_build/src/build/custom/parse/instruction.rs
@@ -59,14 +59,6 @@ impl<'tcx, 'body> ParseCtxt<'tcx, 'body> {
                     unwind: None,
                 })
             },
-            @call("mir_drop_and_replace", args) => {
-                Ok(TerminatorKind::DropAndReplace {
-                    place: self.parse_place(args[0])?,
-                    value: self.parse_operand(args[1])?,
-                    target: self.parse_block(args[2])?,
-                    unwind: None,
-                })
-            },
             @call("mir_call", args) => {
                 let destination = self.parse_place(args[0])?;
                 let target = self.parse_block(args[1])?;
diff --git a/compiler/rustc_mir_build/src/build/scope.rs b/compiler/rustc_mir_build/src/build/scope.rs
index 770701b3750df..4bc2c0ca791e6 100644
--- a/compiler/rustc_mir_build/src/build/scope.rs
+++ b/compiler/rustc_mir_build/src/build/scope.rs
@@ -1072,7 +1072,6 @@ impl<'a, 'tcx> Builder<'a, 'tcx> {
                 TerminatorKind::Assert { .. }
                     | TerminatorKind::Call { .. }
                     | TerminatorKind::Drop { .. }
-                    | TerminatorKind::DropAndReplace { .. }
                     | TerminatorKind::FalseUnwind { .. }
                     | TerminatorKind::InlineAsm { .. }
             ),
@@ -1432,8 +1431,7 @@ impl<'tcx> DropTreeBuilder<'tcx> for Unwind {
                     *unwind = Some(to);
                 }
             }
-            TerminatorKind::DropAndReplace { unwind, .. }
-            | TerminatorKind::FalseUnwind { unwind, .. }
+            TerminatorKind::FalseUnwind { unwind, .. }
             | TerminatorKind::Call { cleanup: unwind, .. }
             | TerminatorKind::Assert { cleanup: unwind, .. }
             | TerminatorKind::InlineAsm { cleanup: unwind, .. } => {
diff --git a/compiler/rustc_mir_build/src/lints.rs b/compiler/rustc_mir_build/src/lints.rs
index f67f24b43c4d7..f6db329fd7cfe 100644
--- a/compiler/rustc_mir_build/src/lints.rs
+++ b/compiler/rustc_mir_build/src/lints.rs
@@ -128,7 +128,6 @@ impl<'mir, 'tcx> TriColorVisitor<BasicBlocks<'tcx>> for Search<'mir, 'tcx> {
             TerminatorKind::Assert { .. }
             | TerminatorKind::Call { .. }
             | TerminatorKind::Drop { .. }
-            | TerminatorKind::DropAndReplace { .. }
             | TerminatorKind::FalseEdge { .. }
             | TerminatorKind::FalseUnwind { .. }
             | TerminatorKind::Goto { .. }
diff --git a/compiler/rustc_mir_dataflow/src/framework/direction.rs b/compiler/rustc_mir_dataflow/src/framework/direction.rs
index 2ae3ae02fcc4e..a40c38aa4c333 100644
--- a/compiler/rustc_mir_dataflow/src/framework/direction.rs
+++ b/compiler/rustc_mir_dataflow/src/framework/direction.rs
@@ -480,7 +480,6 @@ impl Direction for Forward {
 
             Assert { target, cleanup: unwind, expected: _, msg: _, cond: _ }
             | Drop { target, unwind, place: _ }
-            | DropAndReplace { target, unwind, value: _, place: _ }
             | FalseUnwind { real_target: target, unwind } => {
                 if let Some(unwind) = unwind {
                     propagate(unwind, exit_state);
diff --git a/compiler/rustc_mir_dataflow/src/impls/borrowed_locals.rs b/compiler/rustc_mir_dataflow/src/impls/borrowed_locals.rs
index 6f4e7fd4682c1..08fadfe68a17a 100644
--- a/compiler/rustc_mir_dataflow/src/impls/borrowed_locals.rs
+++ b/compiler/rustc_mir_dataflow/src/impls/borrowed_locals.rs
@@ -111,8 +111,7 @@ where
         self.super_terminator(terminator, location);
 
         match terminator.kind {
-            mir::TerminatorKind::Drop { place: dropped_place, .. }
-            | mir::TerminatorKind::DropAndReplace { place: dropped_place, .. } => {
+            mir::TerminatorKind::Drop { place: dropped_place, .. } => {
                 // Drop terminators may call custom drop glue (`Drop::drop`), which takes `&mut
                 // self` as a parameter. In the general case, a drop impl could launder that
                 // reference into the surrounding environment through a raw pointer, thus creating
diff --git a/compiler/rustc_mir_dataflow/src/impls/storage_liveness.rs b/compiler/rustc_mir_dataflow/src/impls/storage_liveness.rs
index fcf0ce9d82118..60fd5169054d3 100644
--- a/compiler/rustc_mir_dataflow/src/impls/storage_liveness.rs
+++ b/compiler/rustc_mir_dataflow/src/impls/storage_liveness.rs
@@ -202,7 +202,6 @@ impl<'mir, 'tcx> crate::GenKillAnalysis<'tcx> for MaybeRequiresStorage<'mir, 'tc
             TerminatorKind::Abort
             | TerminatorKind::Assert { .. }
             | TerminatorKind::Drop { .. }
-            | TerminatorKind::DropAndReplace { .. }
             | TerminatorKind::FalseEdge { .. }
             | TerminatorKind::FalseUnwind { .. }
             | TerminatorKind::GeneratorDrop
@@ -240,7 +239,6 @@ impl<'mir, 'tcx> crate::GenKillAnalysis<'tcx> for MaybeRequiresStorage<'mir, 'tc
             | TerminatorKind::Abort
             | TerminatorKind::Assert { .. }
             | TerminatorKind::Drop { .. }
-            | TerminatorKind::DropAndReplace { .. }
             | TerminatorKind::FalseEdge { .. }
             | TerminatorKind::FalseUnwind { .. }
             | TerminatorKind::GeneratorDrop
diff --git a/compiler/rustc_mir_dataflow/src/move_paths/builder.rs b/compiler/rustc_mir_dataflow/src/move_paths/builder.rs
index 4a163028fcf4a..fa62960eee0ff 100644
--- a/compiler/rustc_mir_dataflow/src/move_paths/builder.rs
+++ b/compiler/rustc_mir_dataflow/src/move_paths/builder.rs
@@ -392,11 +392,6 @@ impl<'b, 'a, 'tcx> Gatherer<'b, 'a, 'tcx> {
                 self.create_move_path(place);
                 self.gather_init(place.as_ref(), InitKind::Deep);
             }
-            TerminatorKind::DropAndReplace { place, ref value, .. } => {
-                self.create_move_path(place);
-                self.gather_operand(value);
-                self.gather_init(place.as_ref(), InitKind::Deep);
-            }
             TerminatorKind::Call {
                 ref func,
                 ref args,
diff --git a/compiler/rustc_mir_dataflow/src/value_analysis.rs b/compiler/rustc_mir_dataflow/src/value_analysis.rs
index 34c60b5ff3c21..b1474a770c59d 100644
--- a/compiler/rustc_mir_dataflow/src/value_analysis.rs
+++ b/compiler/rustc_mir_dataflow/src/value_analysis.rs
@@ -230,7 +230,7 @@ pub trait ValueAnalysis<'tcx> {
             TerminatorKind::Drop { place, .. } => {
                 state.flood_with(place.as_ref(), self.map(), Self::Value::bottom());
             }
-            TerminatorKind::DropAndReplace { .. } | TerminatorKind::Yield { .. } => {
+            TerminatorKind::Yield { .. } => {
                 // They would have an effect, but are not allowed in this phase.
                 bug!("encountered disallowed terminator");
             }
diff --git a/compiler/rustc_mir_transform/src/abort_unwinding_calls.rs b/compiler/rustc_mir_transform/src/abort_unwinding_calls.rs
index 9b4b720702b6f..893018e0d8e73 100644
--- a/compiler/rustc_mir_transform/src/abort_unwinding_calls.rs
+++ b/compiler/rustc_mir_transform/src/abort_unwinding_calls.rs
@@ -74,7 +74,7 @@ impl<'tcx> MirPass<'tcx> for AbortUnwindingCalls {
                     };
                     layout::fn_can_unwind(tcx, fn_def_id, sig.abi())
                 }
-                TerminatorKind::Drop { .. } | TerminatorKind::DropAndReplace { .. } => {
+                TerminatorKind::Drop { .. } => {
                     tcx.sess.opts.unstable_opts.panic_in_drop == PanicStrategy::Unwind
                         && layout::fn_can_unwind(tcx, None, Abi::Rust)
                 }
diff --git a/compiler/rustc_mir_transform/src/add_moves_for_packed_drops.rs b/compiler/rustc_mir_transform/src/add_moves_for_packed_drops.rs
index 9b2260f68251a..896fcd9cdd608 100644
--- a/compiler/rustc_mir_transform/src/add_moves_for_packed_drops.rs
+++ b/compiler/rustc_mir_transform/src/add_moves_for_packed_drops.rs
@@ -64,9 +64,6 @@ fn add_moves_for_packed_drops_patch<'tcx>(tcx: TyCtxt<'tcx>, body: &Body<'tcx>)
             {
                 add_move_for_packed_drop(tcx, body, &mut patch, terminator, loc, data.is_cleanup);
             }
-            TerminatorKind::DropAndReplace { .. } => {
-                span_bug!(terminator.source_info.span, "replace in AddMovesForPackedDrops");
-            }
             _ => {}
         }
     }
diff --git a/compiler/rustc_mir_transform/src/add_retag.rs b/compiler/rustc_mir_transform/src/add_retag.rs
index 7d2146214c6dc..916f2904dda80 100644
--- a/compiler/rustc_mir_transform/src/add_retag.rs
+++ b/compiler/rustc_mir_transform/src/add_retag.rs
@@ -100,7 +100,7 @@ impl<'tcx> MirPass<'tcx> for AddRetag {
                     }
 
                     // `Drop` is also a call, but it doesn't return anything so we are good.
-                    TerminatorKind::Drop { .. } | TerminatorKind::DropAndReplace { .. } => None,
+                    TerminatorKind::Drop { .. } => None,
                     // Not a block ending in a Call -> ignore.
                     _ => None,
                 }
diff --git a/compiler/rustc_mir_transform/src/check_unsafety.rs b/compiler/rustc_mir_transform/src/check_unsafety.rs
index d00ee1f4babe8..ada55a4bf6db1 100644
--- a/compiler/rustc_mir_transform/src/check_unsafety.rs
+++ b/compiler/rustc_mir_transform/src/check_unsafety.rs
@@ -55,7 +55,6 @@ impl<'tcx> Visitor<'tcx> for UnsafetyChecker<'_, 'tcx> {
             | TerminatorKind::Drop { .. }
             | TerminatorKind::Yield { .. }
             | TerminatorKind::Assert { .. }
-            | TerminatorKind::DropAndReplace { .. }
             | TerminatorKind::GeneratorDrop
             | TerminatorKind::Resume
             | TerminatorKind::Abort
diff --git a/compiler/rustc_mir_transform/src/const_prop.rs b/compiler/rustc_mir_transform/src/const_prop.rs
index 6b2eefce24d50..9bc4b26db92eb 100644
--- a/compiler/rustc_mir_transform/src/const_prop.rs
+++ b/compiler/rustc_mir_transform/src/const_prop.rs
@@ -1007,7 +1007,6 @@ impl<'tcx> MutVisitor<'tcx> for ConstPropagator<'_, 'tcx> {
             | TerminatorKind::Return
             | TerminatorKind::Unreachable
             | TerminatorKind::Drop { .. }
-            | TerminatorKind::DropAndReplace { .. }
             | TerminatorKind::Yield { .. }
             | TerminatorKind::GeneratorDrop
             | TerminatorKind::FalseEdge { .. }
diff --git a/compiler/rustc_mir_transform/src/const_prop_lint.rs b/compiler/rustc_mir_transform/src/const_prop_lint.rs
index 6c1980ff3ad93..77402b8737e24 100644
--- a/compiler/rustc_mir_transform/src/const_prop_lint.rs
+++ b/compiler/rustc_mir_transform/src/const_prop_lint.rs
@@ -686,7 +686,6 @@ impl<'tcx> Visitor<'tcx> for ConstPropagator<'_, 'tcx> {
             | TerminatorKind::Return
             | TerminatorKind::Unreachable
             | TerminatorKind::Drop { .. }
-            | TerminatorKind::DropAndReplace { .. }
             | TerminatorKind::Yield { .. }
             | TerminatorKind::GeneratorDrop
             | TerminatorKind::FalseEdge { .. }
diff --git a/compiler/rustc_mir_transform/src/coverage/debug.rs b/compiler/rustc_mir_transform/src/coverage/debug.rs
index 22ea8710e6a96..0e7dc171a5d0c 100644
--- a/compiler/rustc_mir_transform/src/coverage/debug.rs
+++ b/compiler/rustc_mir_transform/src/coverage/debug.rs
@@ -822,7 +822,6 @@ pub(super) fn term_type(kind: &TerminatorKind<'_>) -> &'static str {
         TerminatorKind::Return => "Return",
         TerminatorKind::Unreachable => "Unreachable",
         TerminatorKind::Drop { .. } => "Drop",
-        TerminatorKind::DropAndReplace { .. } => "DropAndReplace",
         TerminatorKind::Call { .. } => "Call",
         TerminatorKind::Assert { .. } => "Assert",
         TerminatorKind::Yield { .. } => "Yield",
diff --git a/compiler/rustc_mir_transform/src/coverage/graph.rs b/compiler/rustc_mir_transform/src/coverage/graph.rs
index a2671eef2e940..c03cacd8615e3 100644
--- a/compiler/rustc_mir_transform/src/coverage/graph.rs
+++ b/compiler/rustc_mir_transform/src/coverage/graph.rs
@@ -156,7 +156,6 @@ impl CoverageGraph {
                 | TerminatorKind::Resume
                 | TerminatorKind::Unreachable
                 | TerminatorKind::Drop { .. }
-                | TerminatorKind::DropAndReplace { .. }
                 | TerminatorKind::Call { .. }
                 | TerminatorKind::GeneratorDrop
                 | TerminatorKind::Assert { .. }
diff --git a/compiler/rustc_mir_transform/src/coverage/spans.rs b/compiler/rustc_mir_transform/src/coverage/spans.rs
index 8ee316773aeaf..d9f68f5d93acc 100644
--- a/compiler/rustc_mir_transform/src/coverage/spans.rs
+++ b/compiler/rustc_mir_transform/src/coverage/spans.rs
@@ -850,7 +850,6 @@ pub(super) fn filtered_terminator_span(terminator: &Terminator<'_>) -> Option<Sp
         TerminatorKind::Unreachable // Unreachable blocks are not connected to the MIR CFG
         | TerminatorKind::Assert { .. }
         | TerminatorKind::Drop { .. }
-        | TerminatorKind::DropAndReplace { .. }
         | TerminatorKind::SwitchInt { .. }
         // For `FalseEdge`, only the `real` branch is taken, so it is similar to a `Goto`.
         | TerminatorKind::FalseEdge { .. }
diff --git a/compiler/rustc_mir_transform/src/coverage/tests.rs b/compiler/rustc_mir_transform/src/coverage/tests.rs
index fa7f22303a8b5..aded8039dc313 100644
--- a/compiler/rustc_mir_transform/src/coverage/tests.rs
+++ b/compiler/rustc_mir_transform/src/coverage/tests.rs
@@ -86,7 +86,6 @@ impl<'tcx> MockBlocks<'tcx> {
             TerminatorKind::Assert { ref mut target, .. }
             | TerminatorKind::Call { target: Some(ref mut target), .. }
             | TerminatorKind::Drop { ref mut target, .. }
-            | TerminatorKind::DropAndReplace { ref mut target, .. }
             | TerminatorKind::FalseEdge { real_target: ref mut target, .. }
             | TerminatorKind::FalseUnwind { real_target: ref mut target, .. }
             | TerminatorKind::Goto { ref mut target }
@@ -184,7 +183,6 @@ fn debug_basic_blocks(mir_body: &Body<'_>) -> String {
                     TerminatorKind::Assert { target, .. }
                     | TerminatorKind::Call { target: Some(target), .. }
                     | TerminatorKind::Drop { target, .. }
-                    | TerminatorKind::DropAndReplace { target, .. }
                     | TerminatorKind::FalseEdge { real_target: target, .. }
                     | TerminatorKind::FalseUnwind { real_target: target, .. }
                     | TerminatorKind::Goto { target }
diff --git a/compiler/rustc_mir_transform/src/dest_prop.rs b/compiler/rustc_mir_transform/src/dest_prop.rs
index 2e481b972781c..3823b6201c347 100644
--- a/compiler/rustc_mir_transform/src/dest_prop.rs
+++ b/compiler/rustc_mir_transform/src/dest_prop.rs
@@ -650,8 +650,7 @@ impl WriteInfo {
             TerminatorKind::Drop { .. } => {
                 // `Drop`s create a `&mut` and so are not considered
             }
-            TerminatorKind::DropAndReplace { .. }
-            | TerminatorKind::Yield { .. }
+            TerminatorKind::Yield { .. }
             | TerminatorKind::GeneratorDrop
             | TerminatorKind::FalseEdge { .. }
             | TerminatorKind::FalseUnwind { .. } => {
diff --git a/compiler/rustc_mir_transform/src/elaborate_drops.rs b/compiler/rustc_mir_transform/src/elaborate_drops.rs
index 29424f09695f1..3faccca823a57 100644
--- a/compiler/rustc_mir_transform/src/elaborate_drops.rs
+++ b/compiler/rustc_mir_transform/src/elaborate_drops.rs
@@ -18,15 +18,14 @@ use rustc_span::{DesugaringKind, Span};
 use rustc_target::abi::VariantIdx;
 use std::fmt;
 
-/// During MIR building, Drop and DropAndReplace terminators are inserted in every place where a drop may occur.
+/// During MIR building, Drop terminators are inserted in every place where a drop may occur.
 /// However, in this phase, the presence of these terminators does not guarantee that a destructor will run,
 /// as the target of the drop may be uninitialized.
 /// In general, the compiler cannot determine at compile time whether a destructor will run or not.
 ///
-/// At a high level, this pass refines Drop and DropAndReplace to only run the destructor if the
+/// At a high level, this pass refines Drop to only run the destructor if the
 /// target is initialized. The way this is achievied is by inserting drop flags for every variable
 /// that may be dropped, and then using those flags to determine whether a destructor should run.
-/// This pass also removes DropAndReplace, replacing it with a Drop paired with an assign statement.
 /// Once this is complete, Drop terminators in the MIR correspond to a call to the "drop glue" or
 /// "drop shim" for the type of the dropped place.
 ///
@@ -121,8 +120,7 @@ fn remove_dead_unwinds<'tcx>(
         .into_results_cursor(body);
     for (bb, bb_data) in body.basic_blocks.iter_enumerated() {
         let place = match bb_data.terminator().kind {
-            TerminatorKind::Drop { ref place, unwind: Some(_), .. }
-            | TerminatorKind::DropAndReplace { ref place, unwind: Some(_), .. } => {
+            TerminatorKind::Drop { ref place, unwind: Some(_), .. } => {
                 und.derefer(place.as_ref(), body).unwrap_or(*place)
             }
             _ => continue,
@@ -343,8 +341,7 @@ impl<'b, 'tcx> ElaborateDropsCtxt<'b, 'tcx> {
             }
             let terminator = data.terminator();
             let place = match terminator.kind {
-                TerminatorKind::Drop { ref place, .. }
-                | TerminatorKind::DropAndReplace { ref place, .. } => {
+                TerminatorKind::Drop { ref place, .. } => {
                     self.un_derefer.derefer(place.as_ref(), self.body).unwrap_or(*place)
                 }
                 _ => continue,
@@ -441,103 +438,11 @@ impl<'b, 'tcx> ElaborateDropsCtxt<'b, 'tcx> {
                         }
                     }
                 }
-                TerminatorKind::DropAndReplace { mut place, ref value, target, unwind } => {
-                    assert!(!data.is_cleanup);
-
-                    if let Some(new_place) = self.un_derefer.derefer(place.as_ref(), self.body) {
-                        place = new_place;
-                    }
-                    self.elaborate_replace(loc, place, value, target, unwind);
-                }
                 _ => continue,
             }
         }
     }
 
-    /// Elaborate a MIR `replace` terminator. This instruction
-    /// is not directly handled by codegen, and therefore
-    /// must be desugared.
-    ///
-    /// The desugaring drops the location if needed, and then writes
-    /// the value (including setting the drop flag) over it in *both* arms.
-    ///
-    /// The `replace` terminator can also be called on places that
-    /// are not tracked by elaboration (for example,
-    /// `replace x[i] <- tmp0`). The borrow checker requires that
-    /// these locations are initialized before the assignment,
-    /// so we just generate an unconditional drop.
-    fn elaborate_replace(
-        &mut self,
-        loc: Location,
-        place: Place<'tcx>,
-        value: &Operand<'tcx>,
-        target: BasicBlock,
-        unwind: Option<BasicBlock>,
-    ) {
-        let bb = loc.block;
-        let data = &self.body[bb];
-        let terminator = data.terminator();
-        assert!(!data.is_cleanup, "DropAndReplace in unwind path not supported");
-
-        let assign = Statement {
-            kind: StatementKind::Assign(Box::new((place, Rvalue::Use(value.clone())))),
-            source_info: terminator.source_info,
-        };
-
-        let unwind = unwind.unwrap_or_else(|| self.patch.resume_block());
-        let unwind = self.patch.new_block(BasicBlockData {
-            statements: vec![assign.clone()],
-            terminator: Some(Terminator {
-                kind: TerminatorKind::Goto { target: unwind },
-                ..*terminator
-            }),
-            is_cleanup: true,
-        });
-
-        let target = self.patch.new_block(BasicBlockData {
-            statements: vec![assign],
-            terminator: Some(Terminator { kind: TerminatorKind::Goto { target }, ..*terminator }),
-            is_cleanup: false,
-        });
-
-        match self.move_data().rev_lookup.find(place.as_ref()) {
-            LookupResult::Exact(path) => {
-                debug!("elaborate_drop_and_replace({:?}) - tracked {:?}", terminator, path);
-                self.init_data.seek_before(loc);
-                elaborate_drop(
-                    &mut Elaborator { ctxt: self },
-                    terminator.source_info,
-                    place,
-                    path,
-                    target,
-                    Unwind::To(unwind),
-                    bb,
-                );
-                on_all_children_bits(self.tcx, self.body, self.move_data(), path, |child| {
-                    self.set_drop_flag(
-                        Location { block: target, statement_index: 0 },
-                        child,
-                        DropFlagState::Present,
-                    );
-                    self.set_drop_flag(
-                        Location { block: unwind, statement_index: 0 },
-                        child,
-                        DropFlagState::Present,
-                    );
-                });
-            }
-            LookupResult::Parent(parent) => {
-                // drop and replace behind a pointer/array/whatever. The location
-                // must be initialized.
-                debug!("elaborate_drop_and_replace({:?}) - untracked {:?}", terminator, parent);
-                self.patch.patch_terminator(
-                    bb,
-                    TerminatorKind::Drop { place, target, unwind: Some(unwind) },
-                );
-            }
-        }
-    }
-
     fn constant_bool(&self, span: Span, val: bool) -> Rvalue<'tcx> {
         Rvalue::Use(Operand::Constant(Box::new(Constant {
             span,
@@ -609,22 +514,12 @@ impl<'b, 'tcx> ElaborateDropsCtxt<'b, 'tcx> {
             debug!("drop_flags_for_locs({:?})", data);
             for i in 0..(data.statements.len() + 1) {
                 debug!("drop_flag_for_locs: stmt {}", i);
-                let mut allow_initializations = true;
                 if i == data.statements.len() {
                     match data.terminator().kind {
                         TerminatorKind::Drop { .. } => {
                             // drop elaboration should handle that by itself
                             continue;
                         }
-                        TerminatorKind::DropAndReplace { .. } => {
-                            // this contains the move of the source and
-                            // the initialization of the destination. We
-                            // only want the former - the latter is handled
-                            // by the elaboration code and must be done
-                            // *after* the destination is dropped.
-                            assert!(self.patch.is_patched(bb));
-                            allow_initializations = false;
-                        }
                         TerminatorKind::Resume => {
                             // It is possible for `Resume` to be patched
                             // (in particular it can be patched to be replaced with
@@ -641,11 +536,7 @@ impl<'b, 'tcx> ElaborateDropsCtxt<'b, 'tcx> {
                     self.body,
                     self.env,
                     loc,
-                    |path, ds| {
-                        if ds == DropFlagState::Absent || allow_initializations {
-                            self.set_drop_flag(loc, path, ds)
-                        }
-                    },
+                    |path, ds| self.set_drop_flag(loc, path, ds),
                 )
             }
 
diff --git a/compiler/rustc_mir_transform/src/generator.rs b/compiler/rustc_mir_transform/src/generator.rs
index 746326f9bde8c..129f366bcd0b0 100644
--- a/compiler/rustc_mir_transform/src/generator.rs
+++ b/compiler/rustc_mir_transform/src/generator.rs
@@ -1199,7 +1199,6 @@ fn can_unwind<'tcx>(tcx: TyCtxt<'tcx>, body: &Body<'tcx>) -> bool {
 
             // These may unwind.
             TerminatorKind::Drop { .. }
-            | TerminatorKind::DropAndReplace { .. }
             | TerminatorKind::Call { .. }
             | TerminatorKind::InlineAsm { .. }
             | TerminatorKind::Assert { .. } => return true,
@@ -1691,7 +1690,6 @@ impl<'tcx> Visitor<'tcx> for EnsureGeneratorFieldAssignmentsNeverAlias<'_> {
             | TerminatorKind::Return
             | TerminatorKind::Unreachable
             | TerminatorKind::Drop { .. }
-            | TerminatorKind::DropAndReplace { .. }
             | TerminatorKind::Assert { .. }
             | TerminatorKind::GeneratorDrop
             | TerminatorKind::FalseEdge { .. }
diff --git a/compiler/rustc_mir_transform/src/inline.rs b/compiler/rustc_mir_transform/src/inline.rs
index 6e6d6566f4bc0..9cba8870f2377 100644
--- a/compiler/rustc_mir_transform/src/inline.rs
+++ b/compiler/rustc_mir_transform/src/inline.rs
@@ -453,9 +453,7 @@ impl<'tcx> Inliner<'tcx> {
             checker.visit_basic_block_data(bb, blk);
 
             let term = blk.terminator();
-            if let TerminatorKind::Drop { ref place, target, unwind }
-            | TerminatorKind::DropAndReplace { ref place, target, unwind, .. } = term.kind
-            {
+            if let TerminatorKind::Drop { ref place, target, unwind } = term.kind {
                 work_list.push(target);
 
                 // If the place doesn't actually need dropping, treat it like a regular goto.
@@ -815,8 +813,7 @@ impl<'tcx> Visitor<'tcx> for CostChecker<'_, 'tcx> {
     fn visit_terminator(&mut self, terminator: &Terminator<'tcx>, location: Location) {
         let tcx = self.tcx;
         match terminator.kind {
-            TerminatorKind::Drop { ref place, unwind, .. }
-            | TerminatorKind::DropAndReplace { ref place, unwind, .. } => {
+            TerminatorKind::Drop { ref place, unwind, .. } => {
                 // If the place doesn't actually need dropping, treat it like a regular goto.
                 let ty = self.instance.subst_mir(tcx, &place.ty(self.callee_body, tcx).ty);
                 if ty.needs_drop(tcx, self.param_env) {
@@ -1120,8 +1117,7 @@ impl<'tcx> MutVisitor<'tcx> for Integrator<'_, 'tcx> {
                     *tgt = self.map_block(*tgt);
                 }
             }
-            TerminatorKind::Drop { ref mut target, ref mut unwind, .. }
-            | TerminatorKind::DropAndReplace { ref mut target, ref mut unwind, .. } => {
+            TerminatorKind::Drop { ref mut target, ref mut unwind, .. } => {
                 *target = self.map_block(*target);
                 *unwind = self.map_unwind(*unwind);
             }
diff --git a/compiler/rustc_mir_transform/src/remove_noop_landing_pads.rs b/compiler/rustc_mir_transform/src/remove_noop_landing_pads.rs
index e3a03aa08af4b..6c067f4529929 100644
--- a/compiler/rustc_mir_transform/src/remove_noop_landing_pads.rs
+++ b/compiler/rustc_mir_transform/src/remove_noop_landing_pads.rs
@@ -75,7 +75,6 @@ impl RemoveNoopLandingPads {
             | TerminatorKind::Unreachable
             | TerminatorKind::Call { .. }
             | TerminatorKind::Assert { .. }
-            | TerminatorKind::DropAndReplace { .. }
             | TerminatorKind::Drop { .. }
             | TerminatorKind::InlineAsm { .. } => false,
         }
diff --git a/compiler/rustc_mir_transform/src/remove_uninit_drops.rs b/compiler/rustc_mir_transform/src/remove_uninit_drops.rs
index 78b6f714a9b0b..e72729b152e69 100644
--- a/compiler/rustc_mir_transform/src/remove_uninit_drops.rs
+++ b/compiler/rustc_mir_transform/src/remove_uninit_drops.rs
@@ -1,5 +1,5 @@
 use rustc_index::bit_set::ChunkedBitSet;
-use rustc_middle::mir::{Body, Field, Rvalue, Statement, StatementKind, TerminatorKind};
+use rustc_middle::mir::{Body, Field, TerminatorKind};
 use rustc_middle::ty::subst::SubstsRef;
 use rustc_middle::ty::{self, ParamEnv, Ty, TyCtxt, VariantDef};
 use rustc_mir_dataflow::impls::MaybeInitializedPlaces;
@@ -8,7 +8,7 @@ use rustc_mir_dataflow::{self, move_path_children_matching, Analysis, MoveDataPa
 
 use crate::MirPass;
 
-/// Removes `Drop` and `DropAndReplace` terminators whose target is known to be uninitialized at
+/// Removes `Drop` terminators whose target is known to be uninitialized at
 /// that point.
 ///
 /// This is redundant with drop elaboration, but we need to do it prior to const-checking, and
@@ -37,8 +37,7 @@ impl<'tcx> MirPass<'tcx> for RemoveUninitDrops {
         let mut to_remove = vec![];
         for (bb, block) in body.basic_blocks.iter_enumerated() {
             let terminator = block.terminator();
-            let (TerminatorKind::Drop { place, .. } | TerminatorKind::DropAndReplace { place, .. })
-                = &terminator.kind
+            let TerminatorKind::Drop { place, .. } = &terminator.kind
             else { continue };
 
             maybe_inits.seek_before_primary_effect(body.terminator_loc(bb));
@@ -64,24 +63,12 @@ impl<'tcx> MirPass<'tcx> for RemoveUninitDrops {
         for bb in to_remove {
             let block = &mut body.basic_blocks_mut()[bb];
 
-            let (TerminatorKind::Drop { target, .. } | TerminatorKind::DropAndReplace { target, .. })
+            let TerminatorKind::Drop { target, .. }
                 = &block.terminator().kind
             else { unreachable!() };
 
             // Replace block terminator with `Goto`.
-            let target = *target;
-            let old_terminator_kind = std::mem::replace(
-                &mut block.terminator_mut().kind,
-                TerminatorKind::Goto { target },
-            );
-
-            // If this is a `DropAndReplace`, we need to emulate the assignment to the return place.
-            if let TerminatorKind::DropAndReplace { place, value, .. } = old_terminator_kind {
-                block.statements.push(Statement {
-                    source_info: block.terminator().source_info,
-                    kind: StatementKind::Assign(Box::new((place, Rvalue::Use(value)))),
-                });
-            }
+            block.terminator_mut().kind = TerminatorKind::Goto { target: *target };
         }
     }
 }
diff --git a/compiler/rustc_mir_transform/src/separate_const_switch.rs b/compiler/rustc_mir_transform/src/separate_const_switch.rs
index a24d2d34d791b..c3f5b881ab8b2 100644
--- a/compiler/rustc_mir_transform/src/separate_const_switch.rs
+++ b/compiler/rustc_mir_transform/src/separate_const_switch.rs
@@ -108,7 +108,6 @@ pub fn separate_const_switch(body: &mut Body<'_>) -> usize {
                         // The following terminators are not allowed
                         TerminatorKind::Resume
                         | TerminatorKind::Drop { .. }
-                        | TerminatorKind::DropAndReplace { .. }
                         | TerminatorKind::Call { .. }
                         | TerminatorKind::Assert { .. }
                         | TerminatorKind::FalseUnwind { .. }
@@ -170,7 +169,6 @@ pub fn separate_const_switch(body: &mut Body<'_>) -> usize {
             | TerminatorKind::Unreachable
             | TerminatorKind::GeneratorDrop
             | TerminatorKind::Assert { .. }
-            | TerminatorKind::DropAndReplace { .. }
             | TerminatorKind::FalseUnwind { .. }
             | TerminatorKind::Drop { .. }
             | TerminatorKind::Call { .. }
diff --git a/compiler/rustc_monomorphize/src/collector.rs b/compiler/rustc_monomorphize/src/collector.rs
index 45e659eab6c85..f529944acce63 100644
--- a/compiler/rustc_monomorphize/src/collector.rs
+++ b/compiler/rustc_monomorphize/src/collector.rs
@@ -808,8 +808,7 @@ impl<'a, 'tcx> MirVisitor<'tcx> for MirNeighborCollector<'a, 'tcx> {
                 let callee_ty = self.monomorphize(callee_ty);
                 visit_fn_use(self.tcx, callee_ty, true, source, &mut self.output)
             }
-            mir::TerminatorKind::Drop { ref place, .. }
-            | mir::TerminatorKind::DropAndReplace { ref place, .. } => {
+            mir::TerminatorKind::Drop { ref place, .. } => {
                 let ty = place.ty(self.body, self.tcx).ty;
                 let ty = self.monomorphize(ty);
                 visit_drop_use(self.tcx, ty, true, source, self.output);
diff --git a/compiler/rustc_smir/Cargo.toml b/compiler/rustc_smir/Cargo.toml
index 5e0d1f369a6a2..fb97ee5bebe6e 100644
--- a/compiler/rustc_smir/Cargo.toml
+++ b/compiler/rustc_smir/Cargo.toml
@@ -4,25 +4,12 @@ version = "0.0.0"
 edition = "2021"
 
 [dependencies]
-rustc_borrowck = { path = "../rustc_borrowck", optional = true }
-rustc_driver = { path = "../rustc_driver", optional = true }
-rustc_hir = { path = "../rustc_hir", optional = true }
-rustc_interface = { path = "../rustc_interface", optional = true }
 rustc_middle = { path = "../rustc_middle", optional = true }
-rustc_mir_dataflow = { path = "../rustc_mir_dataflow", optional = true }
-rustc_mir_transform = { path = "../rustc_mir_transform", optional = true }
-rustc_serialize = { path = "../rustc_serialize", optional = true }
-rustc_trait_selection = { path = "../rustc_trait_selection", optional = true }
+rustc_span = { path = "../rustc_span", optional = true }
+tracing = "0.1"
 
 [features]
 default = [
-    "rustc_borrowck",
-    "rustc_driver",
-    "rustc_hir",
-    "rustc_interface",
     "rustc_middle",
-    "rustc_mir_dataflow",
-    "rustc_mir_transform",
-    "rustc_serialize",
-    "rustc_trait_selection",
+    "rustc_span",
 ]
diff --git a/compiler/rustc_smir/README.md b/compiler/rustc_smir/README.md
index ae49098dd0ce6..31dee955f491f 100644
--- a/compiler/rustc_smir/README.md
+++ b/compiler/rustc_smir/README.md
@@ -73,3 +73,40 @@ git subtree pull --prefix=compiler/rustc_smir https://github.com/rust-lang/proje
 Note: only ever sync to rustc from the project-stable-mir's `smir` branch. Do not sync with your own forks.
 
 Then open a PR against rustc just like a regular PR.
+
+## Stable MIR Design
+
+The stable-mir will follow a similar approach to proc-macro2. It’s
+implementation will eventually be broken down into two main crates:
+
+- `stable_mir`: Public crate, to be published on crates.io, which will contain
+the stable data structure as well as proxy APIs to make calls to the
+compiler.
+- `rustc_smir`: The compiler crate that will translate from internal MIR to
+SMIR. This crate will also implement APIs that will be invoked by
+stable-mir to query the compiler for more information.
+
+This will help tools to communicate with the rust compiler via stable APIs. Tools will depend on
+`stable_mir` crate, which will invoke the compiler using APIs defined in `rustc_smir`. I.e.:
+
+```
+    ┌──────────────────────────────────┐           ┌──────────────────────────────────┐
+    │   External Tool     ┌──────────┐ │           │ ┌──────────┐   Rust Compiler     │
+    │                     │          │ │           │ │          │                     │
+    │                     │stable_mir| │           │ │rustc_smir│                     │
+    │                     │          │ ├──────────►| │          │                     │
+    │                     │          │ │◄──────────┤ │          │                     │
+    │                     │          │ │           │ │          │                     │
+    │                     │          │ │           │ │          │                     │
+    │                     └──────────┘ │           │ └──────────┘                     │
+    └──────────────────────────────────┘           └──────────────────────────────────┘
+```
+
+More details can be found here:
+https://hackmd.io/XhnYHKKuR6-LChhobvlT-g?view
+
+For now, the code for these two crates are in separate modules of this crate.
+The modules have the same name for simplicity. We also have a third module,
+`rustc_internal` which will expose APIs and definitions that allow users to
+gather information from internal MIR constructs that haven't been exposed in
+the `stable_mir` module.
diff --git a/compiler/rustc_smir/rust-toolchain.toml b/compiler/rustc_smir/rust-toolchain.toml
index 7b696fc1f5cec..157dfd620ee1b 100644
--- a/compiler/rustc_smir/rust-toolchain.toml
+++ b/compiler/rustc_smir/rust-toolchain.toml
@@ -1,3 +1,3 @@
 [toolchain]
-channel = "nightly-2022-06-01"
+channel = "nightly-2023-02-28"
 components = [ "rustfmt", "rustc-dev" ]
diff --git a/compiler/rustc_smir/src/lib.rs b/compiler/rustc_smir/src/lib.rs
index 3e93c6bba977f..54d474db038e9 100644
--- a/compiler/rustc_smir/src/lib.rs
+++ b/compiler/rustc_smir/src/lib.rs
@@ -11,9 +11,9 @@
     test(attr(allow(unused_variables), deny(warnings)))
 )]
 #![cfg_attr(not(feature = "default"), feature(rustc_private))]
-#![deny(rustc::untranslatable_diagnostic)]
-#![deny(rustc::diagnostic_outside_of_impl)]
 
-pub mod mir;
+pub mod rustc_internal;
+pub mod stable_mir;
 
-pub mod very_unstable;
+// Make this module private for now since external users should not call these directly.
+mod rustc_smir;
diff --git a/compiler/rustc_smir/src/mir.rs b/compiler/rustc_smir/src/mir.rs
deleted file mode 100644
index 887e657293066..0000000000000
--- a/compiler/rustc_smir/src/mir.rs
+++ /dev/null
@@ -1,10 +0,0 @@
-pub use crate::very_unstable::hir::ImplicitSelfKind;
-pub use crate::very_unstable::middle::mir::{
-    visit::MutVisitor, AggregateKind, AssertKind, BasicBlock, BasicBlockData, BinOp, BindingForm,
-    BlockTailInfo, Body, BorrowKind, CastKind, ClearCrossCrate, Constant, ConstantKind,
-    CopyNonOverlapping, Coverage, FakeReadCause, Field, GeneratorInfo, InlineAsmOperand, Local,
-    LocalDecl, LocalInfo, LocalKind, Location, MirPhase, MirSource, NullOp, Operand, Place,
-    PlaceRef, ProjectionElem, ProjectionKind, Promoted, RetagKind, Rvalue, Safety, SourceInfo,
-    SourceScope, SourceScopeData, SourceScopeLocalData, Statement, StatementKind, UnOp,
-    UserTypeProjection, UserTypeProjections, VarBindingForm, VarDebugInfo, VarDebugInfoContents,
-};
diff --git a/compiler/rustc_smir/src/rustc_internal/mod.rs b/compiler/rustc_smir/src/rustc_internal/mod.rs
new file mode 100644
index 0000000000000..3eaff9c051f1c
--- /dev/null
+++ b/compiler/rustc_smir/src/rustc_internal/mod.rs
@@ -0,0 +1,15 @@
+//! Module that implements the bridge between Stable MIR and internal compiler MIR.
+//!
+//! For that, we define APIs that will temporarily be public to 3P that exposes rustc internal APIs
+//! until stable MIR is complete.
+
+use crate::stable_mir;
+pub use rustc_span::def_id::{CrateNum, DefId};
+
+pub fn item_def_id(item: &stable_mir::CrateItem) -> DefId {
+    item.0
+}
+
+pub fn crate_num(item: &stable_mir::Crate) -> CrateNum {
+    item.id.into()
+}
diff --git a/compiler/rustc_smir/src/rustc_smir/mod.rs b/compiler/rustc_smir/src/rustc_smir/mod.rs
new file mode 100644
index 0000000000000..d956f0ac80213
--- /dev/null
+++ b/compiler/rustc_smir/src/rustc_smir/mod.rs
@@ -0,0 +1,48 @@
+//! Module that implements what will become the rustc side of Stable MIR.
+//!
+//! This module is responsible for building Stable MIR components from internal components.
+//!
+//! This module is not intended to be invoked directly by users. It will eventually
+//! become the public API of rustc that will be invoked by the `stable_mir` crate.
+//!
+//! For now, we are developing everything inside `rustc`, thus, we keep this module private.
+
+use crate::stable_mir::{self};
+use rustc_middle::ty::{tls::with, TyCtxt};
+use rustc_span::def_id::{CrateNum, LOCAL_CRATE};
+use tracing::debug;
+
+/// Get information about the local crate.
+pub fn local_crate() -> stable_mir::Crate {
+    with(|tcx| smir_crate(tcx, LOCAL_CRATE))
+}
+
+/// Retrieve a list of all external crates.
+pub fn external_crates() -> Vec<stable_mir::Crate> {
+    with(|tcx| tcx.crates(()).iter().map(|crate_num| smir_crate(tcx, *crate_num)).collect())
+}
+
+/// Find a crate with the given name.
+pub fn find_crate(name: &str) -> Option<stable_mir::Crate> {
+    with(|tcx| {
+        [LOCAL_CRATE].iter().chain(tcx.crates(()).iter()).find_map(|crate_num| {
+            let crate_name = tcx.crate_name(*crate_num).to_string();
+            (name == crate_name).then(|| smir_crate(tcx, *crate_num))
+        })
+    })
+}
+
+/// Retrieve all items of the local crate that have a MIR associated with them.
+pub fn all_local_items() -> stable_mir::CrateItems {
+    with(|tcx| {
+        tcx.mir_keys(()).iter().map(|item| stable_mir::CrateItem(item.to_def_id())).collect()
+    })
+}
+
+/// Build a stable mir crate from a given crate number.
+fn smir_crate(tcx: TyCtxt<'_>, crate_num: CrateNum) -> stable_mir::Crate {
+    let crate_name = tcx.crate_name(crate_num).to_string();
+    let is_local = crate_num == LOCAL_CRATE;
+    debug!(?crate_name, ?crate_num, "smir_crate");
+    stable_mir::Crate { id: crate_num.into(), name: crate_name, is_local }
+}
diff --git a/compiler/rustc_smir/src/stable_mir/mod.rs b/compiler/rustc_smir/src/stable_mir/mod.rs
new file mode 100644
index 0000000000000..cbf52e691fb47
--- /dev/null
+++ b/compiler/rustc_smir/src/stable_mir/mod.rs
@@ -0,0 +1,60 @@
+//! Module that implements the public interface to the Stable MIR.
+//!
+//! This module shall contain all type definitions and APIs that we expect 3P tools to invoke to
+//! interact with the compiler.
+//!
+//! The goal is to eventually move this module to its own crate which shall be published on
+//! [crates.io](https://crates.io).
+//!
+//! ## Note:
+//!
+//! There shouldn't be any direct references to internal compiler constructs in this module.
+//! If you need an internal construct, consider using `rustc_internal` or `rustc_smir`.
+
+use crate::rustc_internal;
+
+/// Use String for now but we should replace it.
+pub type Symbol = String;
+
+/// The number that identifies a crate.
+pub type CrateNum = usize;
+
+/// A unique identification number for each item accessible for the current compilation unit.
+pub type DefId = usize;
+
+/// A list of crate items.
+pub type CrateItems = Vec<CrateItem>;
+
+/// Holds information about a crate.
+#[derive(Clone, PartialEq, Eq, Debug)]
+pub struct Crate {
+    pub(crate) id: CrateNum,
+    pub name: Symbol,
+    pub is_local: bool,
+}
+
+/// Holds information about an item in the crate.
+/// For now, it only stores the item DefId. Use functions inside `rustc_internal` module to
+/// use this item.
+#[derive(Clone, PartialEq, Eq, Debug)]
+pub struct CrateItem(pub(crate) rustc_internal::DefId);
+
+/// Access to the local crate.
+pub fn local_crate() -> Crate {
+    crate::rustc_smir::local_crate()
+}
+
+/// Try to find a crate with the given name.
+pub fn find_crate(name: &str) -> Option<Crate> {
+    crate::rustc_smir::find_crate(name)
+}
+
+/// Try to find a crate with the given name.
+pub fn external_crates() -> Vec<Crate> {
+    crate::rustc_smir::external_crates()
+}
+
+/// Retrieve all items in the local crate that have a MIR associated with them.
+pub fn all_local_items() -> CrateItems {
+    crate::rustc_smir::all_local_items()
+}
diff --git a/compiler/rustc_smir/src/very_unstable.rs b/compiler/rustc_smir/src/very_unstable.rs
deleted file mode 100644
index 12ba133dbb169..0000000000000
--- a/compiler/rustc_smir/src/very_unstable.rs
+++ /dev/null
@@ -1,27 +0,0 @@
-//! This module reexports various crates and modules from unstable rustc APIs.
-//! Add anything you need here and it will get slowly transferred to a stable API.
-//! Only use rustc_smir in your dependencies and use the reexports here instead of
-//! directly referring to the unstable crates.
-
-macro_rules! crates {
-    ($($rustc_name:ident -> $name:ident,)*) => {
-        $(
-            #[cfg(not(feature = "default"))]
-            pub extern crate $rustc_name as $name;
-            #[cfg(feature = "default")]
-            pub use $rustc_name as $name;
-        )*
-    }
-}
-
-crates! {
-    rustc_borrowck -> borrowck,
-    rustc_driver -> driver,
-    rustc_hir -> hir,
-    rustc_interface -> interface,
-    rustc_middle -> middle,
-    rustc_mir_dataflow -> dataflow,
-    rustc_mir_transform -> transform,
-    rustc_serialize -> serialize,
-    rustc_trait_selection -> trait_selection,
-}
diff --git a/compiler/rustc_trait_selection/src/traits/misc.rs b/compiler/rustc_trait_selection/src/traits/misc.rs
index b94346b09560a..336db4fee6ced 100644
--- a/compiler/rustc_trait_selection/src/traits/misc.rs
+++ b/compiler/rustc_trait_selection/src/traits/misc.rs
@@ -87,7 +87,12 @@ pub fn type_allowed_to_implement_copy<'tcx>(
             };
             let ty = ocx.normalize(&normalization_cause, param_env, unnormalized_ty);
             let normalization_errors = ocx.select_where_possible();
-            if !normalization_errors.is_empty() {
+
+            // NOTE: The post-normalization type may also reference errors,
+            // such as when we project to a missing type or we have a mismatch
+            // between expected and found const-generic types. Don't report an
+            // additional copy error here, since it's not typically useful.
+            if !normalization_errors.is_empty() || ty.references_error() {
                 tcx.sess.delay_span_bug(field_span, format!("couldn't normalize struct field `{unnormalized_ty}` when checking Copy implementation"));
                 continue;
             }
diff --git a/compiler/rustc_trait_selection/src/traits/mod.rs b/compiler/rustc_trait_selection/src/traits/mod.rs
index 0e047977caa7b..62bad5b49b460 100644
--- a/compiler/rustc_trait_selection/src/traits/mod.rs
+++ b/compiler/rustc_trait_selection/src/traits/mod.rs
@@ -155,10 +155,12 @@ fn pred_known_to_hold_modulo_regions<'tcx>(
         predicate: pred.to_predicate(infcx.tcx),
     };
 
-    let result = infcx.predicate_must_hold_modulo_regions(&obligation);
+    let result = infcx.evaluate_obligation_no_overflow(&obligation);
     debug!(?result);
 
-    if result && has_non_region_infer {
+    if result.must_apply_modulo_regions() && !has_non_region_infer {
+        true
+    } else if result.may_apply() {
         // Because of inference "guessing", selection can sometimes claim
         // to succeed while the success requires a guess. To ensure
         // this function's result remains infallible, we must confirm
@@ -179,7 +181,7 @@ fn pred_known_to_hold_modulo_regions<'tcx>(
             }
         }
     } else {
-        result
+        false
     }
 }
 
diff --git a/library/core/src/intrinsics/mir.rs b/library/core/src/intrinsics/mir.rs
index 72db1d87ca3c0..d2d9771bdce2e 100644
--- a/library/core/src/intrinsics/mir.rs
+++ b/library/core/src/intrinsics/mir.rs
@@ -227,7 +227,7 @@
 //! are no resume and abort terminators, and terminators that might unwind do not have any way to
 //! indicate the unwind block.
 //!
-//!  - [`Goto`], [`Return`], [`Unreachable`], [`Drop`](Drop()), and [`DropAndReplace`] have associated functions.
+//!  - [`Goto`], [`Return`], [`Unreachable`] and [`Drop`](Drop()) have associated functions.
 //!  - `match some_int_operand` becomes a `SwitchInt`. Each arm should be `literal => basic_block`
 //!     - The exception is the last arm, which must be `_ => basic_block` and corresponds to the
 //!       otherwise branch.
@@ -259,7 +259,6 @@ define!("mir_return", fn Return() -> BasicBlock);
 define!("mir_goto", fn Goto(destination: BasicBlock) -> BasicBlock);
 define!("mir_unreachable", fn Unreachable() -> BasicBlock);
 define!("mir_drop", fn Drop<T>(place: T, goto: BasicBlock));
-define!("mir_drop_and_replace", fn DropAndReplace<T>(place: T, value: T, goto: BasicBlock));
 define!("mir_call", fn Call<T>(place: T, goto: BasicBlock, call: T));
 define!("mir_storage_live", fn StorageLive<T>(local: T));
 define!("mir_storage_dead", fn StorageDead<T>(local: T));
diff --git a/src/ci/docker/host-x86_64/x86_64-gnu-llvm-14/Dockerfile b/src/ci/docker/host-x86_64/x86_64-gnu-llvm-14/Dockerfile
index db6032f875211..a007bf183ee11 100644
--- a/src/ci/docker/host-x86_64/x86_64-gnu-llvm-14/Dockerfile
+++ b/src/ci/docker/host-x86_64/x86_64-gnu-llvm-14/Dockerfile
@@ -62,6 +62,4 @@ ENV SCRIPT ../x.py --stage 2 test --exclude src/tools/tidy && \
            # work.
            #
            ../x.ps1 --stage 2 test tests/ui --pass=check \
-                             --host='' --target=i686-unknown-linux-gnu && \
-           # Run tidy at the very end, after all the other tests.
-           python2.7 ../x.py --stage 2 test src/tools/tidy
+                             --host='' --target=i686-unknown-linux-gnu
diff --git a/src/ci/github-actions/problem_matchers.json b/src/ci/github-actions/problem_matchers.json
new file mode 100644
index 0000000000000..37561924b7d4f
--- /dev/null
+++ b/src/ci/github-actions/problem_matchers.json
@@ -0,0 +1,15 @@
+{
+    "problemMatcher": [
+        {
+            "owner": "tidy-error-file-line",
+            "pattern": [
+                {
+                    "regexp": "^tidy error: /checkout/(.+):(\\d+): (.+)$",
+                    "file": 1,
+                    "line": 2,
+                    "message": 3
+                }
+            ]
+        }
+    ]
+}
diff --git a/src/ci/scripts/run-build-from-ci.sh b/src/ci/scripts/run-build-from-ci.sh
index c02117f459de0..55e75800d91c4 100755
--- a/src/ci/scripts/run-build-from-ci.sh
+++ b/src/ci/scripts/run-build-from-ci.sh
@@ -10,6 +10,8 @@ source "$(cd "$(dirname "$0")" && pwd)/../shared.sh"
 export CI="true"
 export SRC=.
 
+echo "::add-matcher::src/ci/github-actions/problem_matchers.json"
+
 # Remove any preexisting rustup installation since it can interfere
 # with the cargotest step and its auto-detection of things like Clippy in
 # the environment
diff --git a/src/tools/clippy/clippy_utils/src/qualify_min_const_fn.rs b/src/tools/clippy/clippy_utils/src/qualify_min_const_fn.rs
index 1a35fe05067fc..c00800291dbd3 100644
--- a/src/tools/clippy/clippy_utils/src/qualify_min_const_fn.rs
+++ b/src/tools/clippy/clippy_utils/src/qualify_min_const_fn.rs
@@ -299,10 +299,6 @@ fn check_terminator<'tcx>(
         | TerminatorKind::Unreachable => Ok(()),
 
         TerminatorKind::Drop { place, .. } => check_place(tcx, *place, span, body),
-        TerminatorKind::DropAndReplace { place, value, .. } => {
-            check_place(tcx, *place, span, body)?;
-            check_operand(tcx, value, span, body)
-        },
 
         TerminatorKind::SwitchInt { discr, targets: _ } => check_operand(tcx, discr, span, body),
 
diff --git a/tests/mir-opt/building/custom/terminators.drop_first.built.after.mir b/tests/mir-opt/building/custom/terminators.drop_first.built.after.mir
index c903e5946961b..ada78c0fc782e 100644
--- a/tests/mir-opt/building/custom/terminators.drop_first.built.after.mir
+++ b/tests/mir-opt/building/custom/terminators.drop_first.built.after.mir
@@ -4,10 +4,11 @@ fn drop_first(_1: WriteOnDrop<'_>, _2: WriteOnDrop<'_>) -> () {
     let mut _0: ();                      // return place in scope 0 at $DIR/terminators.rs:+0:59: +0:59
 
     bb0: {
-        replace(_1 <- move _2) -> bb1;   // scope 0 at $DIR/terminators.rs:+3:13: +3:49
+        drop(_1) -> bb1;                 // scope 0 at $DIR/terminators.rs:+3:13: +3:30
     }
 
     bb1: {
-        return;                          // scope 0 at $DIR/terminators.rs:+7:13: +7:21
+        _1 = move _2;                    // scope 0 at $DIR/terminators.rs:+7:13: +7:24
+        return;                          // scope 0 at $DIR/terminators.rs:+8:13: +8:21
     }
 }
diff --git a/tests/mir-opt/building/custom/terminators.rs b/tests/mir-opt/building/custom/terminators.rs
index c23233fcf9aca..f12405661685b 100644
--- a/tests/mir-opt/building/custom/terminators.rs
+++ b/tests/mir-opt/building/custom/terminators.rs
@@ -48,10 +48,11 @@ impl<'a> Drop for WriteOnDrop<'a> {
 fn drop_first<'a>(a: WriteOnDrop<'a>, b: WriteOnDrop<'a>) {
     mir!(
         {
-            DropAndReplace(a, Move(b), retblock)
+            Drop(a, retblock)
         }
 
         retblock = {
+            a = Move(b);
             Return()
         }
     )
diff --git a/tests/ui-fulldeps/stable-mir/crate-info.rs b/tests/ui-fulldeps/stable-mir/crate-info.rs
new file mode 100644
index 0000000000000..4458ab0162e95
--- /dev/null
+++ b/tests/ui-fulldeps/stable-mir/crate-info.rs
@@ -0,0 +1,104 @@
+// run-pass
+// Test that users are able to use stable mir APIs to retrieve information of the current crate
+
+// ignore-stage-1
+// ignore-cross-compile
+// ignore-remote
+
+#![feature(rustc_private)]
+
+extern crate rustc_driver;
+extern crate rustc_hir;
+extern crate rustc_interface;
+extern crate rustc_middle;
+extern crate rustc_smir;
+
+use rustc_driver::{Callbacks, Compilation, RunCompiler};
+use rustc_hir::def::DefKind;
+use rustc_interface::{interface, Queries};
+use rustc_middle::ty::TyCtxt;
+use rustc_smir::{rustc_internal, stable_mir};
+use std::io::Write;
+
+const CRATE_NAME: &str = "input";
+
+/// This function uses the Stable MIR APIs to get information about the test crate.
+fn test_stable_mir(tcx: TyCtxt<'_>) {
+    // Get the local crate using stable_mir API.
+    let local = stable_mir::local_crate();
+    assert_eq!(&local.name, CRATE_NAME);
+
+    // Find items in the local crate.
+    let items = stable_mir::all_local_items();
+    assert!(has_item(tcx, &items, (DefKind::Fn, "foo_bar")));
+    assert!(has_item(tcx, &items, (DefKind::Fn, "foo::bar")));
+
+    // Find the `std` crate.
+    assert!(stable_mir::find_crate("std").is_some());
+}
+
+// Use internal API to find a function in a crate.
+fn has_item(tcx: TyCtxt, items: &stable_mir::CrateItems, item: (DefKind, &str)) -> bool {
+    items.iter().any(|crate_item| {
+        let def_id = rustc_internal::item_def_id(crate_item);
+        tcx.def_kind(def_id) == item.0 && tcx.def_path_str(def_id) == item.1
+    })
+}
+
+/// This test will generate and analyze a dummy crate using the stable mir.
+/// For that, it will first write the dummy crate into a file.
+/// It will invoke the compiler using a custom Callback implementation, which will
+/// invoke Stable MIR APIs after the compiler has finished its analysis.
+fn main() {
+    let path = "input.rs";
+    generate_input(&path).unwrap();
+    let args = vec![
+        "rustc".to_string(),
+        "--crate-type=lib".to_string(),
+        "--crate-name".to_string(),
+        CRATE_NAME.to_string(),
+        path.to_string(),
+    ];
+    rustc_driver::catch_fatal_errors(|| {
+        RunCompiler::new(&args, &mut SMirCalls {}).run().unwrap();
+    })
+    .unwrap();
+}
+
+struct SMirCalls {}
+
+impl Callbacks for SMirCalls {
+    /// Called after analysis. Return value instructs the compiler whether to
+    /// continue the compilation afterwards (defaults to `Compilation::Continue`)
+    fn after_analysis<'tcx>(
+        &mut self,
+        _compiler: &interface::Compiler,
+        queries: &'tcx Queries<'tcx>,
+    ) -> Compilation {
+        queries.global_ctxt().unwrap().enter(|tcx| {
+            test_stable_mir(tcx);
+        });
+        // No need to keep going.
+        Compilation::Stop
+    }
+}
+
+fn generate_input(path: &str) -> std::io::Result<()> {
+    let mut file = std::fs::File::create(path)?;
+    write!(
+        file,
+        r#"
+    mod foo {{
+        pub fn bar(i: i32) -> i64 {{
+            i as i64
+        }}
+    }}
+
+    pub fn foo_bar(x: i32, y: i32) -> i64 {{
+        let x_64 = foo::bar(x);
+        let y_64 = foo::bar(y);
+        x_64.wrapping_add(y_64)
+    }}"#
+    )?;
+    Ok(())
+}
diff --git a/tests/ui/coherence/illegal-copy-bad-projection.rs b/tests/ui/coherence/illegal-copy-bad-projection.rs
new file mode 100644
index 0000000000000..797443a0abe5a
--- /dev/null
+++ b/tests/ui/coherence/illegal-copy-bad-projection.rs
@@ -0,0 +1,16 @@
+trait AsPtr {
+    type Ptr;
+}
+
+impl AsPtr for () {
+    type Ptr = *const void;
+    //~^ ERROR cannot find type `void` in this scope
+}
+
+#[derive(Copy, Clone)]
+struct Foo {
+    p: <() as AsPtr>::Ptr,
+    // Do not report a "`Copy` cannot be implemented" here.
+}
+
+fn main() {}
diff --git a/tests/ui/coherence/illegal-copy-bad-projection.stderr b/tests/ui/coherence/illegal-copy-bad-projection.stderr
new file mode 100644
index 0000000000000..8fed9ba23b24b
--- /dev/null
+++ b/tests/ui/coherence/illegal-copy-bad-projection.stderr
@@ -0,0 +1,9 @@
+error[E0412]: cannot find type `void` in this scope
+  --> $DIR/illegal-copy-bad-projection.rs:6:23
+   |
+LL |     type Ptr = *const void;
+   |                       ^^^^ not found in this scope
+
+error: aborting due to previous error
+
+For more information about this error, try `rustc --explain E0412`.
diff --git a/tests/ui/const-generics/bad-generic-in-copy-impl.rs b/tests/ui/const-generics/bad-generic-in-copy-impl.rs
new file mode 100644
index 0000000000000..b5663464cf422
--- /dev/null
+++ b/tests/ui/const-generics/bad-generic-in-copy-impl.rs
@@ -0,0 +1,9 @@
+#[derive(Copy, Clone)]
+pub struct Foo {
+    x: [u8; SIZE],
+    //~^ ERROR mismatched types
+}
+
+const SIZE: u32 = 1;
+
+fn main() {}
diff --git a/tests/ui/const-generics/bad-generic-in-copy-impl.stderr b/tests/ui/const-generics/bad-generic-in-copy-impl.stderr
new file mode 100644
index 0000000000000..25701ce68ccc8
--- /dev/null
+++ b/tests/ui/const-generics/bad-generic-in-copy-impl.stderr
@@ -0,0 +1,9 @@
+error[E0308]: mismatched types
+  --> $DIR/bad-generic-in-copy-impl.rs:3:13
+   |
+LL |     x: [u8; SIZE],
+   |             ^^^^ expected `usize`, found `u32`
+
+error: aborting due to previous error
+
+For more information about this error, try `rustc --explain E0308`.