1 files changed, 39 insertions, 0 deletions
diff --git a/tests/ui/liveness/liveness-dead.rs b/tests/ui/liveness/liveness-dead.rs
new file mode 100644
index 00000000000..004663c85ee
--- /dev/null
+++ b/tests/ui/liveness/liveness-dead.rs
@@ -0,0 +1,39 @@
+#![allow(dead_code)]
+#![deny(unused_assignments)]
+
+fn f1(x: &mut isize) {
+    *x = 1; // no error
+}
+
+fn f2() {
+    let mut x: isize = 3; //~ ERROR: value assigned to `x` is never read
+    x = 4;
+    x.clone();
+}
+
+fn f3() {
+    let mut x: isize = 3;
+    x.clone();
+    x = 4; //~ ERROR: value assigned to `x` is never read
+}
+
+fn f4(mut x: i32) { //~ ERROR: value passed to `x` is never read
+    x = 4;
+    x.clone();
+}
+
+fn f5(mut x: i32) {
+    x.clone();
+    x = 4; //~ ERROR: value assigned to `x` is never read
+}
+
+// #22630
+fn f6() {
+    let mut done = false;
+    while !done {
+        done = true; // no error
+        continue;
+    }
+}
+
+fn main() {}