1 files changed, 10 insertions, 0 deletions

diff --git a/tests/ui/issues/issue-17999.rs b/tests/ui/issues/issue-17999.rs
new file mode 100644
index 00000000000..941f1e7755a
--- /dev/null
+++ b/tests/ui/issues/issue-17999.rs
@@ -0,0 +1,10 @@
+#![deny(unused_variables)]
+
+fn main() {
+    for _ in 1..101 {
+        let x = (); //~ ERROR: unused variable: `x`
+        match () {
+            a => {} //~ ERROR: unused variable: `a`
+        }
+    }
+}