1 files changed, 10 insertions, 0 deletions
diff --git a/tests/ui/deduplicate-diagnostics.rs b/tests/ui/deduplicate-diagnostics.rs
new file mode 100644
index 000000000..7d1c4f5f8
--- /dev/null
+++ b/tests/ui/deduplicate-diagnostics.rs
@@ -0,0 +1,10 @@
+// revisions: duplicate deduplicate
+//[deduplicate] compile-flags: -Z deduplicate-diagnostics=yes
+
+#[derive(Unresolved)] //~ ERROR cannot find derive macro `Unresolved` in this scope
+                      //[duplicate]~| ERROR cannot find derive macro `Unresolved` in this scope
+struct S;
+
+#[deny("literal")] //~ ERROR malformed lint attribute input
+                   //[duplicate]~| ERROR malformed lint attribute input
+fn main() {}