1 files changed, 9 insertions, 0 deletions
diff --git a/tests/ui/feature-gates/feature-gate-macro-metavar-expr-concat.rs b/tests/ui/feature-gates/feature-gate-macro-metavar-expr-concat.rs
new file mode 100644
index 00000000000..e700999ae4b
--- /dev/null
+++ b/tests/ui/feature-gates/feature-gate-macro-metavar-expr-concat.rs
@@ -0,0 +1,9 @@
+macro_rules! join {
+    ($lhs:ident, $rhs:ident) => {
+        let ${concat($lhs, $rhs)}: () = ();
+        //~^ ERROR the `concat` meta-variable expression is unstable
+    };
+}
+
+fn main() {
+}