1 files changed, 18 insertions, 0 deletions
diff --git a/tests/ui/const-generics/legacy-const-generics.rs b/tests/ui/const-generics/legacy-const-generics.rs
new file mode 100644
index 00000000000..9abc72d98e6
--- /dev/null
+++ b/tests/ui/const-generics/legacy-const-generics.rs
@@ -0,0 +1,18 @@
+// aux-build:legacy-const-generics.rs
+// run-pass
+
+#![feature(rustc_attrs)]
+
+extern crate legacy_const_generics;
+
+#[rustc_legacy_const_generics(1)]
+pub fn bar<const Y: usize>(x: usize, z: usize) -> [usize; 3] {
+    [x, Y, z]
+}
+
+fn main() {
+    assert_eq!(legacy_const_generics::foo(0 + 0, 1 + 1, 2 + 2), [0, 2, 4]);
+    assert_eq!(legacy_const_generics::foo::<{1 + 1}>(0 + 0, 2 + 2), [0, 2, 4]);
+    // FIXME: Only works cross-crate
+    //assert_eq!(bar(0, 1, 2), [0, 1, 2]);
+}