From 4ccfa97021abbe228dbf9dcc36c76ce7489b08b3 Mon Sep 17 00:00:00 2001
From: Maybe Waffle <waffle.lapkin@gmail.com>
Date: Tue, 11 Jan 2022 03:39:43 +0300
Subject: [PATCH] Add a test for ungated `#[rustc_must_implement_one_of]`

This test checks that `#[rustc_must_implement_one_of]` is gated behind
`#![feature(rustc_attrs)]`.
---
 .../rustc_must_implement_one_of_gated.rs            | 13 +++++++++++++
 .../rustc_must_implement_one_of_gated.stderr        | 11 +++++++++++
 2 files changed, 24 insertions(+)
 create mode 100644 src/test/ui/traits/default-method/rustc_must_implement_one_of_gated.rs
 create mode 100644 src/test/ui/traits/default-method/rustc_must_implement_one_of_gated.stderr

diff --git a/src/test/ui/traits/default-method/rustc_must_implement_one_of_gated.rs b/src/test/ui/traits/default-method/rustc_must_implement_one_of_gated.rs
new file mode 100644
index 000000000000..ec2995872de0
--- /dev/null
+++ b/src/test/ui/traits/default-method/rustc_must_implement_one_of_gated.rs
@@ -0,0 +1,13 @@
+#[rustc_must_implement_one_of(eq, neq)]
+//~^ the `#[rustc_must_implement_one_of]` attribute is used to change minimal complete definition of a trait, it's currently in experimental form and should be changed before being exposed outside of the std
+trait Equal {
+    fn eq(&self, other: &Self) -> bool {
+        !self.neq(other)
+    }
+
+    fn neq(&self, other: &Self) -> bool {
+        !self.eq(other)
+    }
+}
+
+fn main() {}
diff --git a/src/test/ui/traits/default-method/rustc_must_implement_one_of_gated.stderr b/src/test/ui/traits/default-method/rustc_must_implement_one_of_gated.stderr
new file mode 100644
index 000000000000..228bc3e35c21
--- /dev/null
+++ b/src/test/ui/traits/default-method/rustc_must_implement_one_of_gated.stderr
@@ -0,0 +1,11 @@
+error[E0658]: the `#[rustc_must_implement_one_of]` attribute is used to change minimal complete definition of a trait, it's currently in experimental form and should be changed before being exposed outside of the std
+  --> $DIR/rustc_must_implement_one_of_gated.rs:1:1
+   |
+LL | #[rustc_must_implement_one_of(eq, neq)]
+   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+   |
+   = help: add `#![feature(rustc_attrs)]` to the crate attributes to enable
+
+error: aborting due to previous error
+
+For more information about this error, try `rustc --explain E0658`.