1 files changed, 17 insertions, 0 deletions
diff --git a/src/test/ui/borrowck/issue-52713-bug.rs b/src/test/ui/borrowck/issue-52713-bug.rs
new file mode 100644
index 000000000..671e83dfa
--- /dev/null
+++ b/src/test/ui/borrowck/issue-52713-bug.rs
@@ -0,0 +1,17 @@
+// Regression test for a bug in #52713: this was an optimization for
+// computing liveness that wound up accidentally causing the program
+// below to be accepted.
+
+fn foo<'a>(x: &'a mut u32) -> u32 {
+    let mut x = 22;
+    let y = &x;
+    if false {
+        return x;
+    }
+
+    x += 1; //~ ERROR
+    println!("{}", y);
+    return 0;
+}
+
+fn main() { }