4 files changed, 5 insertions, 0 deletions
diff --git a/src/libsyntax_ext/deriving/cmp/eq.rs b/src/libsyntax_ext/deriving/cmp/eq.rs
index 1b855c56a48..8bd12c39337 100644
--- a/src/libsyntax_ext/deriving/cmp/eq.rs
+++ b/src/libsyntax_ext/deriving/cmp/eq.rs
@@ -62,6 +62,7 @@ pub fn expand_deriving_eq(cx: &mut ExtCtxt,
                 ret_ty: nil_ty(),
                 attributes: attrs,
                 is_unsafe: false,
+                unify_fieldless_variants: true,
                 combine_substructure: combine_substructure(Box::new(|a, b, c| {
                     cs_total_eq_assert(a, b, c)
                 }))
diff --git a/src/libsyntax_ext/deriving/cmp/ord.rs b/src/libsyntax_ext/deriving/cmp/ord.rs
index 74706c47087..6133adb8fc5 100644
--- a/src/libsyntax_ext/deriving/cmp/ord.rs
+++ b/src/libsyntax_ext/deriving/cmp/ord.rs
@@ -42,6 +42,7 @@ pub fn expand_deriving_ord(cx: &mut ExtCtxt,
                 ret_ty: Literal(path_std!(cx, core::cmp::Ordering)),
                 attributes: attrs,
                 is_unsafe: false,
+                unify_fieldless_variants: true,
                 combine_substructure: combine_substructure(Box::new(|a, b, c| {
                     cs_cmp(a, b, c)
                 })),
diff --git a/src/libsyntax_ext/deriving/cmp/partial_eq.rs b/src/libsyntax_ext/deriving/cmp/partial_eq.rs
index 6406ee59a5e..e5890d7213b 100644
--- a/src/libsyntax_ext/deriving/cmp/partial_eq.rs
+++ b/src/libsyntax_ext/deriving/cmp/partial_eq.rs
@@ -73,6 +73,7 @@ pub fn expand_deriving_partial_eq(cx: &mut ExtCtxt,
                 ret_ty: Literal(path_local!(bool)),
                 attributes: attrs,
                 is_unsafe: false,
+                unify_fieldless_variants: true,
                 combine_substructure: combine_substructure(Box::new(|a, b, c| {
                     $f(a, b, c)
                 }))
diff --git a/src/libsyntax_ext/deriving/cmp/partial_ord.rs b/src/libsyntax_ext/deriving/cmp/partial_ord.rs
index e49c77285ab..cfc6dbe5cd0 100644
--- a/src/libsyntax_ext/deriving/cmp/partial_ord.rs
+++ b/src/libsyntax_ext/deriving/cmp/partial_ord.rs
@@ -38,6 +38,7 @@ pub fn expand_deriving_partial_ord(cx: &mut ExtCtxt,
                 ret_ty: Literal(path_local!(bool)),
                 attributes: attrs,
                 is_unsafe: false,
+                unify_fieldless_variants: true,
                 combine_substructure: combine_substructure(Box::new(|cx, span, substr| {
                     cs_op($op, $equal, cx, span, substr)
                 }))
@@ -62,6 +63,7 @@ pub fn expand_deriving_partial_ord(cx: &mut ExtCtxt,
         ret_ty: ret_ty,
         attributes: attrs,
         is_unsafe: false,
+        unify_fieldless_variants: true,
         combine_substructure: combine_substructure(Box::new(|cx, span, substr| {
             cs_partial_cmp(cx, span, substr)
         }))