1 files changed, 24 insertions, 0 deletions
diff --git a/src/test/ui/single-use-lifetime/zero-uses-in-fn.rs b/src/test/ui/single-use-lifetime/zero-uses-in-fn.rs
new file mode 100644
index 000000000..7f9504fe5
--- /dev/null
+++ b/src/test/ui/single-use-lifetime/zero-uses-in-fn.rs
@@ -0,0 +1,24 @@
+// run-rustfix
+
+// Test that we DO warn when lifetime name is not used at all.
+
+#![deny(unused_lifetimes)]
+#![allow(dead_code, unused_variables)]
+
+fn september<'a>() {}
+//~^ ERROR lifetime parameter `'a` never used
+//~| HELP elide the unused lifetime
+
+fn october<'a, 'b, T>(s: &'b T) -> &'b T {
+    //~^ ERROR lifetime parameter `'a` never used
+    //~| HELP elide the unused lifetime
+    s
+}
+
+fn november<'a, 'b>(s: &'a str) -> &'a str {
+    //~^ ERROR lifetime parameter `'b` never used
+    //~| HELP elide the unused lifetime
+    s
+}
+
+fn main() {}