gccrs: Explicitly use an empty vector for structural eq

Previous code was technically valid since the moved from vector was
empty but explicitly setting it empty with it's own name will help.

gcc/rust/ChangeLog:

	* expand/rust-derive-eq.cc: Use empty vector explicitly.

Signed-off-by: Pierre-Emmanuel Patry <pierre-emmanuel.patry@embecosm.com>

diff --git a/gcc/rust/expand/rust-derive-eq.cc b/gcc/rust/expand/rust-derive-eq.cc
index 7da137fb5c27e6e7367fcd160a6640f2650efdf1..17332a47937ea5f99786af301f0ed50cee3361fd 100644 (file)
--- a/gcc/rust/expand/rust-derive-eq.cc
+++ b/gcc/rust/expand/rust-derive-eq.cc
@@ -128,9 +128,13 @@ DeriveEq::eq_impls (
   auto eq_impl = builder.trait_impl (eq, std::move (eq_generics.self_type),
                                     std::move (trait_items),
                                     std::move (eq_generics.impl));
+
+  // StructuralEq is a marker trait
+  decltype (trait_items) steq_trait_items = {};
+
   auto steq_impl
     = builder.trait_impl (steq, std::move (steq_generics.self_type),
-                         std::move (trait_items),
+                         std::move (steq_trait_items),
                          std::move (steq_generics.impl));
 
   return vec (std::move (eq_impl), std::move (steq_impl));