From 5a4601fea56502e4f50df046c4205e678397599b Mon Sep 17 00:00:00 2001
From: Michael Goulet <michael@errs.io>
Date: Sun, 17 Jul 2022 10:37:23 -0700
Subject: [PATCH] use opaque_ty_origin_unchecked instead of destructuring HIR

---
 compiler/rustc_borrowck/src/type_check/mod.rs  | 16 ++++------------
 compiler/rustc_infer/src/infer/opaque_types.rs |  2 +-
 2 files changed, 5 insertions(+), 13 deletions(-)

diff --git a/compiler/rustc_borrowck/src/type_check/mod.rs b/compiler/rustc_borrowck/src/type_check/mod.rs
index 4776c11e30908..508903049db80 100644
--- a/compiler/rustc_borrowck/src/type_check/mod.rs
+++ b/compiler/rustc_borrowck/src/type_check/mod.rs
@@ -227,17 +227,9 @@ pub(crate) fn type_check<'mir, 'tcx>(
                     let mut hidden_type = infcx.resolve_vars_if_possible(decl.hidden_type);
                     // Check that RPITs are only constrained in their outermost
                     // function, otherwise report a mismatched types error.
-                    if let hir::Node::Item(hir::Item {
-                        kind:
-                            hir::ItemKind::OpaqueTy(hir::OpaqueTy {
-                                origin:
-                                    hir::OpaqueTyOrigin::AsyncFn(parent)
-                                    | hir::OpaqueTyOrigin::FnReturn(parent),
-                                ..
-                            }),
-                        ..
-                    }) = infcx.tcx.hir().get_by_def_id(opaque_type_key.def_id.expect_local()) &&
-                        parent.to_def_id() != body.source.def_id()
+                    if let OpaqueTyOrigin::FnReturn(parent) | OpaqueTyOrigin::AsyncFn(parent)
+                            = infcx.opaque_ty_origin_unchecked(opaque_type_key.def_id, hidden_type.span)
+                        && parent.to_def_id() != body.source.def_id()
                     {
                         infcx
                             .report_mismatched_types(
@@ -247,7 +239,7 @@ pub(crate) fn type_check<'mir, 'tcx>(
                                         body.source.def_id().expect_local(),
                                     ),
                                 ),
-                                infcx.tcx.mk_opaque(opaque_type_key.def_id, opaque_type_key.substs),
+                                infcx.tcx.mk_opaque(opaque_type_key.def_id.to_def_id(), opaque_type_key.substs),
                                 hidden_type.ty,
                                 ty::error::TypeError::Mismatch,
                             )
diff --git a/compiler/rustc_infer/src/infer/opaque_types.rs b/compiler/rustc_infer/src/infer/opaque_types.rs
index 4ee9c4eeda40a..81c3bf5d441f8 100644
--- a/compiler/rustc_infer/src/infer/opaque_types.rs
+++ b/compiler/rustc_infer/src/infer/opaque_types.rs
@@ -433,7 +433,7 @@ impl<'a, 'tcx> InferCtxt<'a, 'tcx> {
     }
 
     #[instrument(skip(self), level = "trace")]
-    fn opaque_ty_origin_unchecked(&self, def_id: LocalDefId, span: Span) -> OpaqueTyOrigin {
+    pub fn opaque_ty_origin_unchecked(&self, def_id: LocalDefId, span: Span) -> OpaqueTyOrigin {
         let origin = match self.tcx.hir().expect_item(def_id).kind {
             hir::ItemKind::OpaqueTy(hir::OpaqueTy { origin, .. }) => origin,
             ref itemkind => {