1 files changed, 47 insertions, 0 deletions
diff --git a/src/test/ui/lint/unused/unused-macro-rules.rs b/src/test/ui/lint/unused/unused-macro-rules.rs
new file mode 100644
index 000000000..eeaf4d1b0
--- /dev/null
+++ b/src/test/ui/lint/unused/unused-macro-rules.rs
@@ -0,0 +1,47 @@
+#![deny(unused_macro_rules)]
+// To make sure we are not hitting this
+#![deny(unused_macros)]
+
+// Most simple case
+macro_rules! num {
+    (one) => { 1 };
+    (two) => { 2 }; //~ ERROR: 2nd rule of macro
+    (three) => { 3 };
+    (four) => { 4 }; //~ ERROR: 4th rule of macro
+}
+const _NUM: u8 = num!(one) + num!(three);
+
+// Check that allowing the lint works
+#[allow(unused_macro_rules)]
+macro_rules! num_allowed {
+    (one) => { 1 };
+    (two) => { 2 };
+    (three) => { 3 };
+    (four) => { 4 };
+}
+const _NUM_ALLOWED: u8 = num_allowed!(one) + num_allowed!(three);
+
+// Check that macro calls inside the macro trigger as usage
+macro_rules! num_rec {
+    (one) => { 1 };
+    (two) => {
+        num_rec!(one) + num_rec!(one)
+    };
+    (three) => { //~ ERROR: 3rd rule of macro
+        num_rec!(one) + num_rec!(two)
+    };
+    (four) => { num_rec!(two) + num_rec!(two) };
+}
+const _NUM_RECURSIVE: u8 = num_rec!(four);
+
+// No error if the macro is being exported
+#[macro_export]
+macro_rules! num_exported {
+    (one) => { 1 };
+    (two) => { 2 };
+    (three) => { 3 };
+    (four) => { 4 };
+}
+const _NUM_EXPORTED: u8 = num_exported!(one) + num_exported!(three);
+
+fn main() {}