1 files changed, 22 insertions, 0 deletions
diff --git a/tests/ui/suggestions/negative-literal-index.rs b/tests/ui/suggestions/negative-literal-index.rs
new file mode 100644
index 000000000..d88b66e67
--- /dev/null
+++ b/tests/ui/suggestions/negative-literal-index.rs
@@ -0,0 +1,22 @@
+// run-rustfix
+
+use std::ops::Index;
+struct X;
+impl Index<i32> for X {
+    type Output = ();
+
+    fn index(&self, _: i32) -> &() {
+        &()
+    }
+}
+
+fn main() {
+    let x = vec![1, 2, 3];
+    x[-1]; //~ ERROR negative integers cannot be used to index on a
+    let x = [1, 2, 3];
+    x[-1]; //~ ERROR negative integers cannot be used to index on a
+    let x = &[1, 2, 3];
+    x[-1]; //~ ERROR negative integers cannot be used to index on a
+    let _ = x;
+    X[-1];
+}