gen: Add back constness of new_bitfield_xxx functions

1 files changed, 1 insertions, 1 deletions

diff --git a/src/gen.rs b/src/gen.rs
index a9620dba..49693929 100644
--- a/src/gen.rs
+++ b/src/gen.rs
@@ -211,7 +211,7 @@ fn gen_unmangle_method(ctx: &mut GenCtx,
         decl: P(fndecl),
         generics: empty_generics(),
         explicit_self: respan(ctx.span, self_kind),
-        constness: ast::Constness::NotConst,
+        constness: ast::Constness::Const,
     };
 
     let block = ast::Block {