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diff --git a/tests/ui/issues/issue-12997-2.rs b/tests/ui/issues/issue-12997-2.rs
new file mode 100644
index 000000000..9df965315
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+++ b/tests/ui/issues/issue-12997-2.rs
@@ -0,0 +1,9 @@
+// compile-flags: --test
+
+//! Test that makes sure wrongly-typed bench functions are rejected
+
+#![feature(test)]
+
+#[bench]
+fn bar(x: isize) { }
+//~^ ERROR mismatched types