1 files changed, 15 insertions, 0 deletions
diff --git a/tests/ui/macros/macro-missing-fragment-deduplication.rs b/tests/ui/macros/macro-missing-fragment-deduplication.rs
new file mode 100644
index 00000000000..c1e6ba74647
--- /dev/null
+++ b/tests/ui/macros/macro-missing-fragment-deduplication.rs
@@ -0,0 +1,15 @@
+// compile-flags: -Zdeduplicate-diagnostics=yes
+
+macro_rules! m {
+    ($name) => {}
+    //~^ ERROR missing fragment
+    //~| ERROR missing fragment
+    //~| WARN this was previously accepted
+}
+
+fn main() {
+    m!();
+    m!();
+    m!();
+    m!();
+}