1 files changed, 44 insertions, 0 deletions
diff --git a/src/test/ui/traits/default-method/rustc_must_implement_one_of.rs b/src/test/ui/traits/default-method/rustc_must_implement_one_of.rs
new file mode 100644
index 000000000..5ba2f5ce3
--- /dev/null
+++ b/src/test/ui/traits/default-method/rustc_must_implement_one_of.rs
@@ -0,0 +1,44 @@
+#![feature(rustc_attrs)]
+
+#[rustc_must_implement_one_of(eq, neq)]
+trait Equal {
+    fn eq(&self, other: &Self) -> bool {
+        !self.neq(other)
+    }
+
+    fn neq(&self, other: &Self) -> bool {
+        !self.eq(other)
+    }
+}
+
+struct T0;
+struct T1;
+struct T2;
+struct T3;
+
+impl Equal for T0 {
+    fn eq(&self, _other: &Self) -> bool {
+        true
+    }
+}
+
+impl Equal for T1 {
+    fn neq(&self, _other: &Self) -> bool {
+        false
+    }
+}
+
+impl Equal for T2 {
+    fn eq(&self, _other: &Self) -> bool {
+        true
+    }
+
+    fn neq(&self, _other: &Self) -> bool {
+        false
+    }
+}
+
+impl Equal for T3 {}
+//~^ not all trait items implemented, missing one of: `eq`, `neq`
+
+fn main() {}