diff --git a/gcc/rust/typecheck/rust-autoderef.cc b/gcc/rust/typecheck/rust-autoderef.cc
index a0a2b50019b..f4dfa668ee3 100644
--- a/gcc/rust/typecheck/rust-autoderef.cc
+++ b/gcc/rust/typecheck/rust-autoderef.cc
@@ -113,7 +113,7 @@ Adjuster::try_unsize_type (TyTy::BaseType *ty)
   auto slice
     = new TyTy::SliceType (mappings.get_next_hir_id (), ty->get_ident ().locus,
 			   TyTy::TyVar (slice_elem->get_ref ()));
-  context->insert_implicit_type (slice);
+  context->insert_implicit_type (slice->get_ref (), slice);
 
   return Adjustment (Adjustment::AdjustmentType::UNSIZE, ty, slice);
 }
diff --git a/gcc/rust/typecheck/rust-hir-type-check-expr.cc b/gcc/rust/typecheck/rust-hir-type-check-expr.cc
index 2fb4d3cba34..2d9ec835995 100644
--- a/gcc/rust/typecheck/rust-hir-type-check-expr.cc
+++ b/gcc/rust/typecheck/rust-hir-type-check-expr.cc
@@ -1576,7 +1576,7 @@ TypeCheckExpr::visit (HIR::ClosureExpr &expr)
   TyTy::TupleType *closure_args
     = new TyTy::TupleType (implicit_args_id, expr.get_locus (),
 			   parameter_types);
-  context->insert_implicit_type (closure_args);
+  context->insert_implicit_type (closure_args->get_ref (), closure_args);
 
   location_t result_type_locus = expr.has_return_type ()
 				   ? expr.get_return_type ().get_locus ()
diff --git a/gcc/rust/typecheck/rust-hir-type-check-pattern.cc b/gcc/rust/typecheck/rust-hir-type-check-pattern.cc
index 765504fa785..bc816fd49ab 100644
--- a/gcc/rust/typecheck/rust-hir-type-check-pattern.cc
+++ b/gcc/rust/typecheck/rust-hir-type-check-pattern.cc
@@ -653,7 +653,8 @@ ClosureParamInfer::Resolve (HIR::Pattern &pattern)
 
   if (resolver.infered->get_kind () != TyTy::TypeKind::ERROR)
     {
-      resolver.context->insert_implicit_type (resolver.infered);
+      resolver.context->insert_implicit_type (resolver.infered->get_ref (),
+					      resolver.infered);
       resolver.mappings.insert_location (resolver.infered->get_ref (),
 					 pattern.get_locus ());
     }
diff --git a/gcc/rust/typecheck/rust-hir-type-check.h b/gcc/rust/typecheck/rust-hir-type-check.h
index 21ecf2ce786..65f38c6099c 100644
--- a/gcc/rust/typecheck/rust-hir-type-check.h
+++ b/gcc/rust/typecheck/rust-hir-type-check.h
@@ -171,7 +171,6 @@ class TypeCheckContext
 
   void insert_type (const Analysis::NodeMapping &mappings,
 		    TyTy::BaseType *type);
-  void insert_implicit_type (TyTy::BaseType *type);
   bool lookup_type (HirId id, TyTy::BaseType **type) const;
   void clear_type (TyTy::BaseType *ty);
 
diff --git a/gcc/rust/typecheck/rust-typecheck-context.cc b/gcc/rust/typecheck/rust-typecheck-context.cc
index 4cee74ae250..907833fba97 100644
--- a/gcc/rust/typecheck/rust-typecheck-context.cc
+++ b/gcc/rust/typecheck/rust-typecheck-context.cc
@@ -90,13 +90,6 @@ TypeCheckContext::insert_type (const Analysis::NodeMapping &mappings,
   resolved[id] = type;
 }
 
-void
-TypeCheckContext::insert_implicit_type (TyTy::BaseType *type)
-{
-  rust_assert (type != nullptr);
-  resolved[type->get_ref ()] = type;
-}
-
 void
 TypeCheckContext::insert_implicit_type (HirId id, TyTy::BaseType *type)
 {