AffineConstraints: Fix compile warning in new code

diff --git a/include/deal.II/lac/affine_constraints.templates.h b/include/deal.II/lac/affine_constraints.templates.h
index 5bc85a5ab74d7dad4201b614a71a76fe9f840269..745326e4b20935c9677f2663fdd2ff2271d5a74f 100644 (file)
--- a/include/deal.II/lac/affine_constraints.templates.h
+++ b/include/deal.II/lac/affine_constraints.templates.h
@@ -324,6 +324,7 @@ namespace internal
     const auto sort_and_make_unique = [&constraints_in, &locally_owned_dofs](
                                         std::vector<ConstraintType>
                                           &locally_relevant_constraints) {
+      (void)constraints_in;
       if (locally_relevant_constraints.empty())
         return;