Revert "use opaque_ty_origin_unchecked instead of destructuring HIR"

This reverts commit 5a4601f.

Author: compiler-errors

compiler/rustc_borrowck/src/type_check/mod.rs

@@ -227,9 +227,17 @@ 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 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()
+                    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()
                     {
                         infcx
                             .report_mismatched_types(
@@ -239,7 +247,7 @@ pub(crate) fn type_check<'mir, 'tcx>(
                                         body.source.def_id().expect_local(),
                                     ),
                                 ),
-                                infcx.tcx.mk_opaque(opaque_type_key.def_id.to_def_id(), opaque_type_key.substs),
+                                infcx.tcx.mk_opaque(opaque_type_key.def_id, opaque_type_key.substs),
                                 hidden_type.ty,
                                 ty::error::TypeError::Mismatch,
                             )

compiler/rustc_infer/src/infer/opaque_types.rs

@@ -438,7 +438,7 @@ impl<'a, 'tcx> InferCtxt<'a, 'tcx> {
     }
 
     #[instrument(skip(self), level = "trace")]
-    pub fn opaque_ty_origin_unchecked(&self, def_id: LocalDefId, span: Span) -> OpaqueTyOrigin {
+    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 => {