1 files changed, 13 insertions, 0 deletions
diff --git a/tests/ui/consts/auxiliary/unstable_but_const_stable.rs b/tests/ui/consts/auxiliary/unstable_but_const_stable.rs
new file mode 100644
index 00000000000..88044b0272c
--- /dev/null
+++ b/tests/ui/consts/auxiliary/unstable_but_const_stable.rs
@@ -0,0 +1,13 @@
+#![feature(staged_api, rustc_attrs, intrinsics)]
+#![stable(since="1.0.0", feature = "stable")]
+
+extern "rust-intrinsic" {
+    #[unstable(feature = "unstable", issue = "42")]
+    #[rustc_const_stable(feature = "stable", since = "1.0.0")]
+    #[rustc_nounwind]
+    pub fn write_bytes<T>(dst: *mut T, val: u8, count: usize);
+}
+
+#[unstable(feature = "unstable", issue = "42")]
+#[rustc_const_stable(feature = "stable", since = "1.0.0")]
+pub const fn some_unstable_fn() {}