diff --git a/gcc/rust/hir/rust-ast-lower-base.cc b/gcc/rust/hir/rust-ast-lower-base.cc
index a4bcfd6c4b4..098014ff92b 100644
--- a/gcc/rust/hir/rust-ast-lower-base.cc
+++ b/gcc/rust/hir/rust-ast-lower-base.cc
@@ -824,7 +824,7 @@ ASTLoweringBase::lower_qualifiers (const AST::FunctionQualifiers &qualifiers)
 }
 
 void
-ASTLoweringBase::handle_outer_attributes (const HIR::Item &item)
+ASTLoweringBase::handle_outer_attributes (const ItemWrapper &item)
 {
   for (const auto &attr : item.get_outer_attrs ())
     {
@@ -855,7 +855,7 @@ ASTLoweringBase::handle_outer_attributes (const HIR::Item &item)
 }
 
 void
-ASTLoweringBase::handle_doc_item_attribute (const HIR::Item &item,
+ASTLoweringBase::handle_doc_item_attribute (const ItemWrapper &item,
 					    const AST::Attribute &attr)
 {
   auto simple_doc_comment = attr.has_attr_input ()
@@ -878,7 +878,7 @@ ASTLoweringBase::handle_doc_item_attribute (const HIR::Item &item,
 }
 
 void
-ASTLoweringBase::handle_lang_item_attribute (const HIR::Item &item,
+ASTLoweringBase::handle_lang_item_attribute (const ItemWrapper &item,
 					     const AST::Attribute &attr)
 {
   auto &literal = static_cast<AST::AttrInputLiteral &> (attr.get_attr_input ());
diff --git a/gcc/rust/hir/rust-ast-lower-base.h b/gcc/rust/hir/rust-ast-lower-base.h
index f08e3185451..adcbc5d2f69 100644
--- a/gcc/rust/hir/rust-ast-lower-base.h
+++ b/gcc/rust/hir/rust-ast-lower-base.h
@@ -29,6 +29,30 @@
 namespace Rust {
 namespace HIR {
 
+// proxy class so we can do attribute checking on items and trait items
+class ItemWrapper
+{
+public:
+  ItemWrapper (const HIR::Item &item)
+    : mappings (item.get_mappings ()), locus (item.get_locus ()),
+      outer_attrs (item.get_outer_attrs ())
+  {}
+
+  ItemWrapper (const HIR::TraitItem &item)
+    : mappings (item.get_mappings ()), locus (item.get_trait_locus ()),
+      outer_attrs (item.get_outer_attrs ())
+  {}
+
+  const Analysis::NodeMapping &get_mappings () const { return mappings; }
+  Location get_locus () const { return locus; }
+  const AST::AttrVec &get_outer_attrs () const { return outer_attrs; }
+
+private:
+  const Analysis::NodeMapping &mappings;
+  Location locus;
+  const AST::AttrVec &outer_attrs;
+};
+
 // base class to allow derivatives to overload as needed
 class ASTLoweringBase : public AST::ASTVisitor
 {
@@ -264,12 +288,12 @@ protected:
   HIR::FunctionQualifiers
   lower_qualifiers (const AST::FunctionQualifiers &qualifiers);
 
-  void handle_outer_attributes (const HIR::Item &item);
+  void handle_outer_attributes (const ItemWrapper &item);
 
-  void handle_lang_item_attribute (const HIR::Item &item,
+  void handle_lang_item_attribute (const ItemWrapper &item,
 				   const AST::Attribute &attr);
 
-  void handle_doc_item_attribute (const HIR::Item &item,
+  void handle_doc_item_attribute (const ItemWrapper &item,
 				  const AST::Attribute &attr);
 
   bool is_known_attribute (const std::string &attribute_path) const;
diff --git a/gcc/rust/hir/rust-ast-lower-implitem.h b/gcc/rust/hir/rust-ast-lower-implitem.h
index 69436543825..709bb573046 100644
--- a/gcc/rust/hir/rust-ast-lower-implitem.h
+++ b/gcc/rust/hir/rust-ast-lower-implitem.h
@@ -305,16 +305,14 @@ public:
 
     if (resolver.translated != nullptr)
       {
-	// FIXME
+	auto id = resolver.translated->get_mappings ().get_hirid ();
+	auto defid = resolver.translated->get_mappings ().get_defid ();
+	auto locus = resolver.translated->get_trait_locus ();
 
-	// auto id = resolver.translated->get_mappings ().get_hirid ();
-	// auto defid = resolver.translated->get_mappings ().get_defid ();
-	// auto locus = resolver.translated->get_locus ();
-
-	// resolver.handle_outer_attributes (*resolver.translated);
+	resolver.handle_outer_attributes (*resolver.translated);
 	resolver.mappings->insert_hir_trait_item (resolver.translated);
-	// resolver.mappings->insert_location (id, locus);
-	// resolver.mappings->insert_defid_mapping (defid, resolver.item_cast);
+	resolver.mappings->insert_location (id, locus);
+	resolver.mappings->insert_defid_mapping (defid, resolver.translated);
       }
 
     return resolver.translated;
diff --git a/gcc/rust/hir/tree/rust-hir-item.h b/gcc/rust/hir/tree/rust-hir-item.h
index 8d371e00b98..7f665159572 100644
--- a/gcc/rust/hir/tree/rust-hir-item.h
+++ b/gcc/rust/hir/tree/rust-hir-item.h
@@ -2394,6 +2394,8 @@ public:
     return outer_attrs;
   }
 
+  Location get_trait_locus () const override { return get_locus (); }
+
 protected:
   // Clone function implementation as (not pure) virtual method
   TraitItemFunc *clone_trait_item_impl () const override
@@ -2480,6 +2482,8 @@ public:
     return outer_attrs;
   }
 
+  Location get_trait_locus () const override { return get_locus (); }
+
 protected:
   // Clone function implementation as (not pure) virtual method
   TraitItemConst *clone_trait_item_impl () const override
@@ -2567,6 +2571,8 @@ public:
     return outer_attrs;
   }
 
+  Location get_trait_locus () const override { return get_locus (); }
+
 protected:
   // Clone function implementation as (not pure) virtual method
   TraitItemType *clone_trait_item_impl () const override
diff --git a/gcc/rust/hir/tree/rust-hir.h b/gcc/rust/hir/tree/rust-hir.h
index 2614ef85b29..aa305f1590c 100644
--- a/gcc/rust/hir/tree/rust-hir.h
+++ b/gcc/rust/hir/tree/rust-hir.h
@@ -796,7 +796,9 @@ public:
 
   virtual const std::string trait_identifier () const = 0;
 
-  const Analysis::NodeMapping get_mappings () const { return mappings; }
+  const Analysis::NodeMapping &get_mappings () const { return mappings; }
+
+  virtual Location get_trait_locus () const = 0;
 
   virtual TraitItemKind get_item_kind () const = 0;
 
diff --git a/gcc/rust/util/rust-hir-map.cc b/gcc/rust/util/rust-hir-map.cc
index 7ea782ed4c4..4aeb7f5ae18 100644
--- a/gcc/rust/util/rust-hir-map.cc
+++ b/gcc/rust/util/rust-hir-map.cc
@@ -316,6 +316,7 @@ Mappings::insert_defid_mapping (DefId id, HIR::Item *item)
 
   rust_assert (lookup_defid (id) == nullptr);
   rust_assert (lookup_local_defid (crate_num, local_def_id) == nullptr);
+  rust_assert (lookup_trait_item_defid (id) == nullptr);
 
   defIdMappings[id] = item;
   insert_local_defid_mapping (crate_num, local_def_id, item);
@@ -331,6 +332,29 @@ Mappings::lookup_defid (DefId id)
   return it->second;
 }
 
+void
+Mappings::insert_defid_mapping (DefId id, HIR::TraitItem *item)
+{
+  CrateNum crate_num = id.crateNum;
+  LocalDefId local_def_id = id.localDefId;
+
+  rust_assert (lookup_defid (id) == nullptr);
+  rust_assert (lookup_local_defid (crate_num, local_def_id) == nullptr);
+  rust_assert (lookup_trait_item_defid (id) == nullptr);
+
+  defIdTraitItemMappings[id] = item;
+}
+
+HIR::TraitItem *
+Mappings::lookup_trait_item_defid (DefId id)
+{
+  auto it = defIdTraitItemMappings.find (id);
+  if (it == defIdTraitItemMappings.end ())
+    return nullptr;
+
+  return it->second;
+}
+
 void
 Mappings::insert_hir_item (HIR::Item *item)
 {
diff --git a/gcc/rust/util/rust-hir-map.h b/gcc/rust/util/rust-hir-map.h
index addd9efc3b0..13cae717031 100644
--- a/gcc/rust/util/rust-hir-map.h
+++ b/gcc/rust/util/rust-hir-map.h
@@ -104,6 +104,8 @@ public:
 
   void insert_defid_mapping (DefId id, HIR::Item *item);
   HIR::Item *lookup_defid (DefId id);
+  void insert_defid_mapping (DefId id, HIR::TraitItem *item);
+  HIR::TraitItem *lookup_trait_item_defid (DefId id);
 
   void insert_local_defid_mapping (CrateNum crateNum, LocalDefId id,
 				   HIR::Item *item);
@@ -307,6 +309,7 @@ private:
   std::map<CrateNum, AST::Crate *> ast_crate_mappings;
   std::map<CrateNum, HIR::Crate *> hir_crate_mappings;
   std::map<DefId, HIR::Item *> defIdMappings;
+  std::map<DefId, HIR::TraitItem *> defIdTraitItemMappings;
   std::map<CrateNum, std::map<LocalDefId, HIR::Item *>> localDefIdMappings;
 
   std::map<HirId, HIR::Module *> hirModuleMappings;
