1 files changed, 41 insertions, 0 deletions
diff --git a/tests/ui/attributes/duplicated-attributes.rs b/tests/ui/attributes/duplicated-attributes.rs
new file mode 100644
index 000000000..84a5abcf8
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+++ b/tests/ui/attributes/duplicated-attributes.rs
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+// Test that, if an item is annotated with a builtin attribute more than once, a warning is
+// emitted.
+// Tests https://github.com/rust-lang/rust/issues/90979
+
+// check-pass
+// compile-flags: --test
+
+#![feature(test)]
+#![feature(cfg_eval)]
+
+#[test]
+#[test]
+//~^ WARNING duplicated attribute
+fn f() {}
+
+// The following shouldn't trigger an error. The attribute is not duplicated.
+#[test]
+fn f2() {}
+
+// The following shouldn't trigger an error either. The second attribute is not #[test].
+#[test]
+#[inline]
+fn f3() {}
+
+extern crate test;
+use test::Bencher;
+
+#[bench]
+#[bench]
+//~^ WARNING duplicated attribute
+fn f4(_: &mut Bencher) {}
+
+#[cfg_eval]
+#[cfg_eval]
+//~^ WARNING duplicated attribute
+struct S;
+
+#[cfg_eval]
+struct S2;
+
+fn main() {}