1 files changed, 4 insertions, 0 deletions
diff --git a/tests/ui/borrowck/writing-to-immutable-vec.rs b/tests/ui/borrowck/writing-to-immutable-vec.rs
new file mode 100644
index 00000000000..dbcc3f0bbe9
--- /dev/null
+++ b/tests/ui/borrowck/writing-to-immutable-vec.rs
@@ -0,0 +1,4 @@
+fn main() {
+    let v: Vec<isize> = vec![1, 2, 3];
+    v[1] = 4; //~ ERROR cannot borrow `v` as mutable, as it is not declared as mutable
+}