Remove some direct calls to local_def_id_to_hir_id on diagnostics

Author: spastorino

compiler/rustc_middle/src/hir/map/mod.rs

@@ -316,7 +316,7 @@ impl<'hir> Map<'hir> {
     /// Retrieves the `Node` corresponding to `id`, returning `None` if cannot be found.
     #[inline]
     pub fn find_by_def_id(self, id: LocalDefId) -> Option<Node<'hir>> {
-        self.find(self.local_def_id_to_hir_id(id))
+        self.find(self.tcx.opt_local_def_id_to_hir_id(id)?)
     }
 
     /// Retrieves the `Node` corresponding to `id`, panicking if it cannot be found.
@@ -333,7 +333,7 @@ impl<'hir> Map<'hir> {
     }
 
     pub fn get_if_local(self, id: DefId) -> Option<Node<'hir>> {
-        id.as_local().and_then(|id| self.find(self.local_def_id_to_hir_id(id)))
+        id.as_local().and_then(|id| self.find(self.tcx.opt_local_def_id_to_hir_id(id)?))
     }
 
     pub fn get_generics(self, id: LocalDefId) -> Option<&'hir Generics<'hir>> {

compiler/rustc_trait_selection/src/traits/error_reporting/on_unimplemented.rs

@@ -144,6 +144,10 @@ impl<'tcx> TypeErrCtxtExt<'tcx> for TypeErrCtxt<'_, 'tcx> {
         trait_ref: ty::PolyTraitRef<'tcx>,
         obligation: &PredicateObligation<'tcx>,
     ) -> OnUnimplementedNote {
+        if self.tcx.opt_rpitit_info(obligation.cause.body_id.to_def_id()).is_some() {
+            return OnUnimplementedNote::default();
+        }
+
         let (def_id, substs) = self
             .impl_similar_to(trait_ref, obligation)
             .unwrap_or_else(|| (trait_ref.def_id(), trait_ref.skip_binder().substs));